Pick up the wrong degreaser and you can damage an aluminium component, strip a freshly painted surface, fill a confined workspace with solvent vapour, or simply spend twenty minutes scrubbing something that the right product would have cleaned in thirty seconds. Industrial degreasers look similar on the shelf — spray cans, concentrate bottles, trigger packs — but the chemistry behind them is fundamentally different, and chemistry determines what each one actually does to grease, to surfaces, and to the people using them.
This guide covers every type of industrial degreaser used in Australian maintenance and manufacturing environments, explains how they work, and gives you a practical framework for choosing the right one for each job. Whether you are maintaining CNC equipment, servicing conveyor drives, cleaning parts before lubrication or adhesive application, prepping surfaces for welding, or managing workshop floor hygiene, this is the reference you need.
AIMS Industrial stocks a range of industrial degreasers, contact cleaners and parts cleaning chemicals for maintenance, engineering and production environments. Contact the AIMS team to discuss your requirements.
What Is an Industrial Degreaser?
Degreasers are an essential part of maintenance, repair and operations (MRO) across every sector of Australian industry. They are used as a precursor step before lubricant application, before adhesive bonding, before welding, before painting, before assembly of close-tolerance parts, and as routine housekeeping in any environment where oil and grease contamination accumulates. A surface that has not been properly degreased before a threadlocker, retaining compound, or structural adhesive is applied will fail to cure correctly — the consequences range from fastener back-off to catastrophic joint failure.
Industrial degreasers are not interchangeable. The same product that safely strips cutting oil from a steel lathe chuck may etch aluminium alloy components, lift paint from a gearbox housing, or leave a residue incompatible with the adhesive being applied in the next step. Choosing the right degreaser requires understanding the type of contamination, the surface material, the application method, and the workplace safety and environmental requirements.
How Degreasing Works: Two Fundamental Mechanisms
All industrial degreasers work through one of two basic chemical mechanisms, or a combination of both. Understanding the difference explains why different degreaser types behave differently in practice.
Solvent Mechanism
Solvent-based degreasers dissolve hydrocarbon contamination by exploiting the principle that like dissolves like. Organic solvents — whether petroleum-derived (mineral spirits, kerosene), chlorinated (trichloroethylene, perchloroethylene), ketone-based (acetone, MEK), or bio-derived (d-limonene from citrus) — share the non-polar molecular structure of oils and greases. They penetrate the contamination, break the molecular bonds holding the grease to the surface, and carry it away as the solvent evaporates or is wiped off. The result is fast, deep cleaning that leaves a dry, residue-free surface — critical for electronics, precision components, and anywhere that moisture would cause problems. The trade-off is that most solvents are flammable, carry VOC exposure risks, and require careful handling and disposal.
Surfactant Mechanism (Emulsification)
Water-based degreasers use surfactants — detergent molecules with a hydrophobic (water-repelling, oil-attracting) tail and a hydrophilic (water-attracting) head. The surfactant molecules surround oil and grease particles, breaking them into microscopic droplets (micelles) that can be suspended in water. This is emulsification. The emulsified oil droplets are rinsed away with water. Alkaline additives (sodium hydroxide, potassium hydroxide, silicates, phosphates) enhance the surfactant action by saponifying fatty-acid-based oils — converting them to water-soluble soaps. Water-based degreasers are generally safer, less flammable, and easier to handle in large quantities, but they require rinsing, generate contaminated wastewater, and may need heat to work effectively on heavy oil loads.
The Main Types of Industrial Degreaser
1. Solvent-Based Degreasers
Solvent-based degreasers are the traditional heavy-duty option. They evaporate cleanly, leave no water residue, and cut through the most severe hydrocarbon contamination quickly. They are the correct choice when you cannot afford moisture on the surface, when you need fast evaporation with no rinsing, or when dealing with very heavy petroleum soiling that water-based products struggle to shift in a single application.
Petroleum-based solvents (mineral spirits, kerosene, naphtha) are moderate-strength, widely available, and suitable for general engineering and workshop degreasing. They are flammable and have moderate odour. Mineral spirits is the common benchmark — effective on machine oils and greases, safe on most metals including aluminium, and relatively low cost.
Chlorinated solvents (historically trichloroethylene, now largely replaced) offered exceptional degreasing power, non-flammability, and fast evaporation — ideal for vapour degreasing tanks. Under current Australian WHS regulations and workplace exposure standards, trichloroethylene (TCE) is subject to strict controls: it is classified as a Category 1A carcinogen, has a Workplace Exposure Standard of 10 ppm TWA, and requires biological monitoring for exposed workers. Many operations that previously used TCE have transitioned to alternative chemistries. If you are still running TCE vapour degreasing tanks, your obligations are significant and ongoing.
Non-chlorinated solvent blends — including n-propyl bromide-based, HFC, and engineered solvent blends — are the preferred modern alternative for precision vapour degreasing. They offer high degreasing power without the health and environmental profile of chlorinated solvents, but require careful selection for specific substrate compatibility.
Aerosol solvent degreasers (products like CRC Degreaser Heavy Duty, WD-40 Specialist Degreaser) use a propellant to deliver solvent spray. They are practical for spot-cleaning, component access, and areas where a parts washer or immersion tank is not practical. Fast, targeted, residue-free on most metals. Not suited for large surface areas — cost and solvent vapour accumulation become prohibitive.
2. Water-Based Alkaline Degreasers
Water-based alkaline degreasers are the workhorse of industrial cleaning. Formulated with surfactants, alkaline builders (sodium hydroxide, potassium hydroxide, silicates, carbonates), and corrosion inhibitors, they handle a broad range of hydrocarbon contamination, are non-flammable, lower in VOC, and suitable for large-volume application — floors, machine exteriors, parts washers.
High-alkaline formulations (pH 12+) are effective on heavy, baked-on contamination including carbonised grease, manufacturing soils, and cutting fluid residue. They are not safe on aluminium, copper, zinc, or other amphoteric metals — the caustic chemistry attacks the metal surface. Always check the SDS for surface compatibility. Rinse thoroughly after use on ferrous metals to prevent flash rusting — the alkaline rinse water can accelerate surface oxidation on bare steel.
Mildly alkaline formulations (pH 8–11) with corrosion inhibitors are safer for wider material compatibility including aluminium, and are the standard fluid for heated parts washers and recirculating spray cabinets. They are labelled "low-alkaline" or "neutral-to-alkaline" and typically contain inhibitors that form a thin protective layer on metal surfaces during and after cleaning.
Concentrated alkaline degreasers are sold as concentrates and diluted before use — typically 1:10 to 1:30 with water depending on soil load. Buying and storing concentrate dramatically reduces cost per litre, waste packaging, and transport volume. For any facility doing regular large-volume degreasing, concentrate is the economical and practical choice.
Heat significantly improves the performance of water-based degreasers. A parts washer solution heated to 50–65°C will clean in minutes what cold solution takes thirty minutes to achieve. This is the main reason heated parts washing tanks are standard in production environments — the chemistry works with the thermodynamics.
3. Citrus / Bio-Solvent Degreasers
Citrus degreasers use d-limonene — a terpene solvent extracted from citrus peel — as the active cleaning agent. They occupy the space between true solvents and water-based products: they dissolve grease like a solvent, but are biodegradable, derived from renewable sources, less acutely toxic than petroleum solvents, and can be formulated to be water-dispersible (so they rinse away with water).
Citrus degreasers are widely used in Australian industry for equipment and machinery cleaning, parts degreasing, chain cleaning, and surface preparation where a plant-derived product is required for environmental or site certification reasons. They are particularly popular in food processing facilities and environmentally sensitive sites. Their key limitation is that they are slower-acting than petroleum or chlorinated solvents on very heavy petroleum contamination, and they leave a slight terpene residue if not rinsed thoroughly — which can interfere with adhesives, coatings, and precision assemblies.
Important note on compatibility: citrus solvents are mildly acidic (d-limonene pH ~4–5 in water dispersion). Do not mix with alkaline degreasers — the acid-base reaction neutralises both products, wastes chemistry, and can gel in spray systems.
4. Specialist Degreasers
Electrical contact cleaners are fast-evaporating, non-conductive, residue-free solvents designed specifically for cleaning electrical and electronic components — motor windings, PCBs, switch contacts, connectors, relays, and switchgear. Products like CRC Contact Cleaner and WD-40 Specialist Electrical Contact Cleaner evaporate within seconds and leave no residue that could cause electrical tracking or short-circuit. They should never be applied to live high-voltage equipment. For de-energised, low-voltage equipment they are the correct product and safe to use. Do not substitute general-purpose solvent degreaser — the residue profile is completely different.
Food-grade degreasers are formulated to NSF International standards (NSF A1 for incidental food contact; NSF A2 for no food contact) or equivalent under HACCP food safety plans. They are free of food-contact hazards, rinse cleanly and completely, and are mandatory in food processing and preparation environments where equipment contact with food ingredients is possible. Using a non-food-grade degreaser in a food processing environment is a food safety breach.
Biodegradable / eco-safe degreasers are formulated to meet environmental regulations for low toxicity, rapid biodegradation, and low VOC content. They are required on sites with environmental certification (ISO 14001, green star), near waterways, on agricultural sites, and wherever stormwater contamination risk must be controlled. They are typically less aggressive than conventional options on heavy soiling, but adequate for regular maintenance cleaning.
5. Emulsion Degreasers
Emulsion degreasers blend solvent and water-dispersible chemistry into a single product. They provide stronger solvency than a pure water-based product, rinse cleanly with water, and do not require the strict VOC controls of a pure solvent. Common in automotive workshops, manufacturing, and general industrial cleaning where heavy soiling and water rinsing need to coexist. The foaming, clinging versions are effective on vertical surfaces — equipment housings, machine frames, vehicle underbodies — where a spray-and-let-dwell approach is needed.
Degreaser Selection Guide: 4 Questions to Ask First
Getting the degreaser right before you reach for a product comes down to four questions. Answer these and the choice narrows quickly.
1. What is the contamination type?
Heavy petroleum oils, greases, and hydraulic fluid — strong solvent or high-alkaline. Cutting oils and metalworking fluids — alkaline or emulsion. Carbon deposits and baked-on grease — high-alkaline with heat, or strong solvent. General maintenance contamination (machine oil, light grease, grime) — mildly alkaline or citrus. Biological contamination (food-based fats and oils) — food-grade alkaline. Electronic flux and residue — electrical contact cleaner. The contamination dictates the chemistry required.
2. What is the surface material?
Steel and cast iron — all degreaser types are generally compatible, but rinse alkaline products quickly to prevent flash rust. Aluminium, copper, brass, zinc — avoid high-alkaline (pH 12+); use citrus, neutral-to-mildly-alkaline with inhibitors, or purpose-formulated solvent. Painted surfaces — avoid strong solvents and high concentration alkaline; mildly alkaline or citrus at proper dilution. Rubber and plastics — check product SDS; many solvents attack specific rubber compounds and thermoplastics. Concrete and sealed floors — alkaline or citrus with dwell time; solvent degreasers evaporate before they penetrate.
3. What is the application method?
Aerosol or trigger spray (spot degreasing) — solvent aerosol or ready-to-use water-based trigger. Mop or brush (floors, large flat surfaces) — diluted alkaline concentrate. Parts washer tank (recirculating, heated) — purpose-formulated low-foaming alkaline concentrate with corrosion inhibitor. Ultrasonic bath — specific low-foaming aqueous chemistry. Immersion soak — alkaline concentrate or solvent depending on substrate. Pressure wash or automated cabinet — low-foam alkaline concentrate.
4. What are the environment and compliance requirements?
Enclosed or poorly ventilated space — water-based is strongly preferred; solvent requires LEV (local exhaust ventilation) and RPE. Food processing area — food-grade certification mandatory. Flammable/explosive atmosphere — non-flammable water-based only; no solvents. Near stormwater or waterways — biodegradable formulation required. Sites with environmental ISO 14001 or green certification — low-VOC, low ecotoxicity formulations. Skin and hands in regular contact — water-based with skin-safe pH; solvent requires nitrile gloves.
| Scenario | Best Degreaser Type | Avoid |
|---|---|---|
| Heavy machine oil on steel lathe components | High-alkaline concentrate + heat, or strong solvent | Citrus alone on very heavy loads |
| Aluminium CNC parts after machining | Mildly alkaline + inhibitor (pH 8–10), or citrus | High-alkaline (pH 12+) — etches aluminium |
| Conveyor chain before re-lubrication | Citrus degreaser or aerosol solvent | High-foam water-based in enclosed areas |
| Workshop concrete floor | Alkaline concentrate diluted 1:10, dwell 5–10 min, scrub | Aerosol solvent — evaporates before penetrating |
| Electrical switchgear (de-energised) | Electrical contact cleaner | Any water-based product |
| Motor winding cleaning | Electrical contact cleaner | General solvent degreaser — residue risk |
| Pre-welding surface prep (steel) | Acetone, MEK, or purpose-formulated weld prep solvent | Citrus (terpene residue affects weld quality) |
| Parts washer (heated recirculating tank) | Low-foam alkaline concentrate with corrosion inhibitor | Standard spray degreaser — foams and blocks pumps |
| Food processing equipment | NSF-rated food-grade degreaser | Any non-NSF-certified product |
| Enclosed confined space | Water-based alkaline | Solvent without LEV + RPE — vapour accumulation risk |
| Before adhesive or threadlocker application | Acetone or MEK (solvent, fast-evaporating, residue-free) | Water-based — moisture inhibits anaerobic cure |
| Pre-paint surface prep | Purpose-formulated panel wipe / wax and grease remover | Citrus (residue) or highly alkaline (raises surface pH) |
Industrial Applications: Degreasing by Equipment Type
Bearings and Shaft Assemblies
Bearings removed for inspection or regrease should be degreased before assessment. For sealed and shielded bearings, use an aerosol solvent contact cleaner or purpose-formulated bearing wash to flush the old lubricant without damaging seals. Open bearings can be immersed in parts washer solution (alkaline concentrate) or solvent. After degreasing, dry thoroughly and repack with the correct grease before reinstallation — a degreased bearing that is assembled dry will fail within minutes under load. See the Industrial Lubricants Guide for grease selection after cleaning.
Degreasing removes contamination — but it doesn't isolate a heat-related electrical fault. For workshop electronics diagnosis on intermittent ECU, motor controller or PCB faults, the companion technique is contrast cooling. See our freeze spray guide for the aerosol-cooling diagnostic procedure.
Gearboxes and Drives
External cleaning of gearbox housings: alkaline spray or citrus degreaser, brush agitation, rinse with clean water. Internal drain and flush: specialist gearbox flush oil (not degreaser — residual degreaser chemistry can react with gear lubricant and damage seals). For conveyor chains and drive chains, citrus or aerosol solvent with chain brush works well for removing built-up grit and old lubricant without the mess of alkaline flush. After cleaning, lubricate immediately — bare chain left degreased will begin surface corrosion within hours in a humid environment.
Hydraulic Systems
External cleaning of hydraulic fittings, cylinders, and manifolds: mildly alkaline water-based degreaser or citrus. Never allow water-based degreaser to enter hydraulic system internals — water contamination in hydraulic oil causes cavitation, corrosion, and microbial growth. Internal hydraulic system flushing requires dedicated hydraulic flush oils, not general degreasers. Before replacing hydraulic seals or fittings, clean the interface with a fast-evaporating solvent (isopropyl alcohol or acetone) to ensure the mating surface is residue-free for the new seal compound.
Welding and Fabrication Prep
Weld joint surfaces must be clean and free of oil, grease, paint, and coating before welding. Any residual contamination in the weld zone causes porosity, inclusion defects, and weakened weld integrity. The standard degreasing approach for weld prep is acetone or dedicated weld prep solvent wiped with clean lint-free cloth. Apply with clean cloths only — a rag contaminated with oil will redistribute rather than remove contamination. Avoid citrus-based products for weld prep — terpene residue affects arc stability and weld quality. See the MIG Welding Guide for full pre-weld preparation procedure.
Workshop Floors and Machine Exteriors
Workshop floor degreasing for routine maintenance: alkaline concentrate at 1:10 to 1:20 dilution, mop or floor scrubber, 5-minute dwell, scrub, rinse or wet-vac. For heavy oil spills on concrete, apply concentrate undiluted or at 1:5, allow 10–15 minute dwell, agitate with stiff brush, rinse. Multiple applications may be needed for long-standing oil contamination that has penetrated the concrete surface. Machine exterior cleaning: trigger spray diluted alkaline or citrus, cloth or brush wipe — do not allow water-based product to penetrate electrical enclosures, control panels, or motor vents.
Before Adhesive or Threadlocker Application
Surface preparation before adhesive application is not optional — it is the most critical factor in bond strength. For anaerobic threadlockers, retaining compounds, and pipe sealants (Loctite family), the standard prep is cleaning with acetone or isopropyl alcohol to remove all oil, grease, and moisture from the mating surfaces. Water-based degreasers leave a moisture film that inhibits the anaerobic cure mechanism. For structural epoxy and cyanoacrylate adhesives, the surface should be clean and dry — acetone or MEK wipe. For contact adhesives, light solvent or purpose-formulated cleaner. See the Industrial Adhesive Types Guide for full surface preparation by adhesive type.
How to Use an Industrial Degreaser: Step-by-Step
These steps apply to manual spray-and-wipe or spray-and-rinse degreasing — the most common method in workshop environments.
Step 1: Read the SDS first. Before using any new degreaser, check the Safety Data Sheet. Confirm dilution ratio, surface compatibility, PPE required, first aid, and disposal requirements. Do not skip this step — the SDS is the reference document for safe use.
Step 2: Select and prepare PPE. At minimum: nitrile chemical-resistant gloves; safety glasses or chemical splash goggles. For solvent-based products in enclosed spaces: add P2/OV respirator and ensure ventilation. For high-alkaline products: full arm coverage. See the Safety Glasses Guide and Respirator Guide for PPE selection.
Step 3: Prepare the surface. Remove loose debris, swarf, and gross contamination with a brush, cloth, or air blast before applying degreaser. Applying degreaser to a heavily fouled surface loaded with swarf and grit wastes product and results in poor cleaning. Remove what you can mechanically first.
Step 4: Apply at correct dilution. For concentrated products, dilute as specified in the SDS. General dilution guide: heavy soiling 1:5 to 1:8; medium 1:10 to 1:15; light maintenance 1:20 to 1:30. Apply degreaser to the surface — spray, brush, or cloth wipe depending on area size and access.
Step 5: Allow dwell time. Do not wipe immediately. Allow the degreaser to work: 30–60 seconds for light soiling; 3–5 minutes for medium; 10–15 minutes for heavy, baked-on contamination. Do not allow the degreaser to dry on the surface. If it begins to dry before you are ready to wipe/rinse, reapply to keep the surface wet.
Step 6: Agitate if needed. For stubborn contamination, agitate with a brush, scouring pad, or cloth during the dwell period. Mechanical action combined with chemistry always cleans faster than chemistry alone.
Step 7: Rinse or wipe. Water-based degreasers: rinse thoroughly with clean water. On ferrous metals, follow immediately with a dry cloth — do not allow water to sit. Solvent-based: wipe with clean lint-free cloth. Discard contaminated cloths promptly — do not re-use a cloth that has picked up contamination on a clean surface.
Step 8: Inspect and re-apply if needed. Check that contamination has been removed. For critical applications (adhesive bonding, welding prep, bearing reassembly), a final wipe with clean acetone or IPA on a fresh cloth is good practice — the cloth should come away white or clean.
Surface Compatibility Quick Reference
| Surface | Solvent (Petroleum) | High-Alkaline (pH 12+) | Mildly Alkaline (pH 8–11) | Citrus/Bio | Electrical Contact Cleaner |
|---|---|---|---|---|---|
| Carbon steel / cast iron | ✅ Safe | ✅ Safe — rinse quickly | ✅ Safe | ✅ Safe | ✅ Safe |
| Stainless steel | ✅ Safe | ✅ Safe | ✅ Safe | ✅ Safe | ✅ Safe |
| Aluminium | ✅ Safe (most) | ⚠️ NOT SAFE — etches | ✅ Safe with inhibitors | ✅ Safe | ✅ Safe |
| Copper / brass | ✅ Safe | ⚠️ Risk of tarnish/etch | ⚠️ Check inhibitors | ✅ Safe | ✅ Safe |
| Painted surfaces | ⚠️ Strong solvents strip paint | ⚠️ Concentrated alkaline strips paint | ✅ Safe at correct dilution | ✅ Safe diluted | ⚠️ May soften some paints |
| Rubber seals / gaskets | ⚠️ May swell or degrade | ✅ Generally safe | ✅ Generally safe | ⚠️ Check SDS | ⚠️ Check SDS — some damage rubber |
| Hard plastics (ABS, nylon) | ⚠️ Many solvents attack plastics | ✅ Generally safe | ✅ Generally safe | ✅ Generally safe | ✅ Fast-evaporating = generally safe |
| Polycarbonate | ❌ Solvents craze/crack | ✅ Safe | ✅ Safe | ✅ Safe | ⚠️ Check SDS |
| Concrete floors | ⚠️ Evaporates before penetrating | ✅ Best option | ✅ Effective | ✅ Effective | Not applicable |
| Glass | ✅ Safe (avoid silicate-containing) | ⚠️ Silicate-based alkaline etches glass | ✅ Silicate-free only | ✅ Safe | ✅ Safe |
| Electrical components | ⚠️ Residue risk | ❌ Conductive when wet | ❌ Conductive when wet | ❌ Residue risk | ✅ Purpose-designed — use this |
This table provides general guidance only. Always check the SDS for the specific product and substrate. Spot test on a non-critical area when using an unfamiliar product on a new surface.
Australian WHS Requirements and VOC Compliance
Industrial degreasers — particularly solvent-based formulations — are regulated under Australian work health and safety law and the National Pollutant Inventory. Understanding your obligations is not optional for any PCBU (person conducting a business or undertaking) whose workers use these products.
Workplace Exposure Standards (WES)
Safe Work Australia's Workplace Exposure Standards for Airborne Contaminants (current edition) sets legally binding time-weighted average (TWA) and short-term exposure limit (STEL) concentrations for common solvent components. Relevant standards for common degreaser solvents include:
Mineral spirits / white spirit: TWA 792 mg/m³ (100 ppm). Acetone: TWA 1,187 mg/m³ (500 ppm); STEL 2,374 mg/m³. Isopropyl alcohol (IPA): TWA 983 mg/m³ (400 ppm); STEL 1,230 mg/m³. Xylene: TWA 350 mg/m³ (80 ppm); STEL 655 mg/m³. n-Hexane: TWA 72 mg/m³ (20 ppm) — very low limit; check products containing hexane carefully. Trichloroethylene (TCE): TWA 54 mg/m³ (10 ppm) + biological monitoring required.
These limits apply to the 8-hour average airborne concentration for exposed workers. If your degreasing operation involves frequent or prolonged solvent use in enclosed or poorly ventilated spaces, you may be required to conduct air monitoring to verify compliance. The hierarchy of controls applies: if you can substitute to a water-based product, do so before relying on engineering controls and PPE.
Safe Handling Requirements
Under the model WHS Act, you must provide workers with current SDS for all hazardous chemicals in the workplace, ensure appropriate training in safe use, store chemicals appropriately (including flammable storage cabinets for flammable solvents), and maintain a register of hazardous chemicals. SDS documents must be accessible to workers — not just filed away. Many operations move these to shared digital folders accessible from mobile devices on the floor.
VOC Regulations and Environmental Obligations
Volatile organic compounds (VOCs) from solvent degreasers are regulated under state EPA legislation and the National Environment Protection (NEPM) for ambient air quality. Large solvent users may be required to report to the National Pollutant Inventory (NPI). Wastewater from water-based degreasing operations typically requires trade waste disposal via a licensed contractor — contaminated degreaser solution cannot be discharged to stormwater drains. Check your local council requirements for trade waste approval before setting up any large-scale aqueous degreasing operation.
Flammable Storage
Flammable solvent degreasers must be stored in approved flammable storage cabinets under AS 1940:2017 (The storage and handling of flammable and combustible liquids). Compliance is a legal requirement for commercial and industrial premises. Quantities above threshold limits require licensed storage. Aerosol cans are also classified as flammable goods. Do not store solvent degreasers in standard shelving or near ignition sources.
PPE for Degreaser Use
PPE selection for degreasers depends on the specific product — always refer to the SDS. The following is a practical baseline guide:
All industrial degreasers: Chemical-resistant gloves (nitrile is suitable for most formulations — check SDS for exceptions); safety glasses or chemical splash goggles. See the Safety Glasses Guide for splash rating guidance. Closed-toe safety boots. See the Safety Boots Guide for appropriate footwear in chemical environments.
High-alkaline products: Add forearm protection (chemical-resistant sleeves or long nitrile gloves). High-alkaline concentrates cause serious chemical burns — skin contact must be prevented, not just minimised. End-of-shift hand washing should use a workshop-grade industrial hand cleaner with skin-conditioning ingredients (not dish soap or solvent rinse); see the Hand Cleaner Guide for formulation selection and barrier cream workflow.
Solvent products in enclosed or poorly ventilated spaces: Add respiratory protection — at minimum a half-face respirator with OV/P2 combination cartridge to address both vapour and particulate hazards. Ensure the area is ventilated (cross-ventilation, LEV, or extraction fans) before starting. See the Respirator Guide for cartridge selection by hazard type.
Aerosol sprays: Even in ventilated spaces, eye and skin protection is required. Aerosols create fine mist that travels — protect eyes even for short applications.
Dilution and Dwell Time Reference
| Application | Dilution Ratio | Dwell Time | Notes |
|---|---|---|---|
| Light maintenance cleaning (machine exteriors, bench tops) | 1:20 to 1:30 | 30–60 sec | Wipe clean; no rinsing needed at this dilution for most products |
| General workshop degreasing | 1:10 to 1:15 | 2–5 min | Agitate with brush for better penetration |
| Heavy engineering soiling (machine oil, cutting fluid) | 1:5 to 1:8 | 5–10 min | May need multiple applications on very heavy contamination |
| Workshop floor (oil spill on concrete) | 1:5 undiluted | 10–15 min | Stiff brush, follow with rinse or wet-vac |
| Parts washer (heated recirculating tank) | 1:10 to 1:20 per manufacturer | 5–20 min at 50–65°C | Low-foam concentrate formulated for parts washers only |
| Ultrasonic bath | Per product spec | 5–15 min | Use purpose-formulated ultrasonic cleaning fluid only |
| Pre-adhesive / pre-weld final wipe | Ready-to-use solvent (acetone, IPA) | Wipe, allow 30 sec evaporation | Final wipe should transfer nothing to the cloth |
Disposal of Used Degreaser and Contaminated Rags
Disposal is not the last item on the checklist to be dealt with whenever — it has legal and safety implications that should be part of your degreasing procedure from day one.
Water-based degreaser solution (used, emulsified with oil): Cannot be discharged to stormwater. Most local councils require licensed trade waste disposal for oily water. Contact your local council for trade waste approval requirements. Small quantities of very dilute solution may qualify for sewer disposal with approval, but emulsified oil content makes this unlikely for used parts washer fluid.
Solvent waste: Classified as hazardous waste under state EPA regulations. Must be collected by a licensed liquid waste contractor. Do not pour solvent waste into general waste bins, sewer, or stormwater. Accumulate in sealed, labelled containers as per your hazardous waste management plan.
Contaminated rags — solvent-soaked: Spontaneous combustion is a documented and serious risk with oil-soaked rags, particularly those containing linseed oil or drying agents. Best practice: store used rags in a sealed metal bin partially filled with water, and empty daily. Dispose via licensed hazardous waste contractor. Do not place solvent-soaked rags in open bins, plastic bags, or in piles.
Aerosol cans (empty): Puncture and recycle as scrap metal, or dispose via your local council's scheduled waste collection. Do not incinerate.
Frequently Asked Questions
What is an industrial degreaser and how is it different from a household cleaner?
An industrial degreaser is a concentrated chemical cleaning agent formulated to break down heavy hydrocarbon contamination — machine oils, cutting fluids, grease, carbon deposits, and hydraulic oil — in commercial and industrial environments. Unlike household cleaners, which are dilute and pH-neutral, industrial degreasers are engineered for high-volume soiling, hard surfaces, and continuous use. They are available in much higher concentrations, with specific chemistries matched to application type. Some industrial formulations are also regulated as hazardous chemicals under Australian WHS law — household cleaners are not.
What are the main types of industrial degreaser?
The five main types used in Australian industry are: (1) solvent-based degreasers — dissolve hydrocarbon contamination using organic solvents such as petroleum spirits, ketones, or engineered blends; (2) water-based alkaline degreasers — emulsify oil using surfactants and alkaline builders, non-flammable and suitable for large-volume use; (3) citrus/bio-solvent degreasers — use d-limonene from citrus peel, biodegradable and water-dispersible; (4) specialist degreasers — including electrical contact cleaners and food-grade formulations; and (5) emulsion degreasers — combine solvent solvency with water-rinseable chemistry.
What is the difference between a solvent degreaser and a water-based degreaser?
Solvent degreasers dissolve grease chemically — solvent molecules break apart hydrocarbon chains and carry them away on evaporation. They are fast, residue-free, and effective on heavy petroleum soiling, but carry VOC and flammability risks and require careful WHS management. Water-based degreasers use surfactants to emulsify grease into microscopic droplets suspended in water, which are rinsed away. They are safer, less flammable, and better for environmental compliance, but require rinsing and may need heat to be effective on heavy oil loads.
When should I use a solvent degreaser instead of a water-based one?
Use a solvent-based degreaser when: you need fast, residue-free cleaning where moisture cannot be tolerated (electronics, sealed bearings, precision assemblies, pre-weld prep, pre-adhesive surfaces); there is no facility for rinsing; you are cleaning components that would rust immediately if wetted; or you are dealing with extremely heavy petroleum contamination that water-based products cannot shift efficiently. Use water-based for large-surface cleaning, floor maintenance, parts washers, food processing areas, any confined space where solvent vapour accumulation is a risk, and wherever VOC compliance is a concern.
Is a degreaser the same as parts washer fluid?
Not exactly. Parts washer fluid is a specific type of degreaser formulated for use in recirculating parts washing systems — heated tanks, spray-wash cabinets, or immersion units. It must be low-foaming to prevent flooding spray systems, contain corrosion inhibitors to protect ferrous parts between wash cycles, and remain stable over multiple uses before disposal. Standard spray degreasers are single-application products not designed for recirculating systems. Using a standard degreaser concentrate in a parts washer will produce excessive foam that can flood the system and degrade cleaning performance. Always use a concentrate labelled specifically for parts washer use.
Can I use an industrial degreaser on aluminium?
Some can, some cannot. High-alkaline formulations (pH above 12) react with aluminium, causing etching, pitting, discolouration and surface degradation — even a brief contact time can cause permanent damage to precision aluminium components. Citrus-based degreasers, neutral-to-mildly-alkaline formulations with corrosion inhibitors (pH 8–10), and most petroleum solvents are safe on aluminium. Always check the SDS for surface compatibility, look for explicit "safe on aluminium" labelling, and spot-test on a non-critical area if using an unfamiliar product on aluminium.
Is industrial degreaser safe on painted surfaces?
It depends on the product and the paint. Strong solvents (acetone, MEK, xylene-based formulations) will strip or soften most paints. High-alkaline concentrates at full or near-full strength can lift paint from metal. Mildly alkaline water-based degreasers at correct dilution (1:10 or greater) are generally safe on factory-applied industrial coatings. Citrus degreasers at recommended dilution are typically paint-safe. As a rule, avoid prolonged dwell time on any painted surface regardless of chemistry, and always spot-test on an inconspicuous area first. If the purpose is to remove paint, use a purpose-formulated paint stripper rather than a degreaser.
What dilution ratio should I use for an industrial degreaser?
Dilution depends on the product and the severity of contamination. As a general working guide: light maintenance cleaning — 1:20 to 1:30 (1 part concentrate to 20–30 parts water); medium workshop degreasing — 1:10 to 1:15; heavy soiling and engineering contamination — 1:5 to 1:8; floor cleaning with oil spills — 1:5 to neat. Always follow the manufacturer's SDS — over-dilution reduces effectiveness and wastes labour on multiple passes, while under-dilution wastes product and increases WHS risk. Heated application allows more dilute solutions to achieve the same result as concentrated cold solution.
What is dwell time and why does it matter for degreasing?
Dwell time is the period you allow a degreaser to remain in contact with the contaminated surface before rinsing or wiping. The chemistry needs contact time to penetrate and emulsify the contamination. Too short a dwell time means you are wiping the surface before the product has done its job, requiring more product and more scrubbing. Typical dwell times: 30–60 seconds for light soiling; 3–5 minutes for medium; 10–15 minutes for heavy deposits. Do not allow the degreaser to dry on the surface — dried degreaser leaves residue and requires a second application. If the product starts to dry during dwell time, reapply to keep the surface wet.
What PPE do I need when using industrial degreasers in Australia?
PPE must be selected based on the SDS for the specific product. Minimum baseline for most industrial degreasers: chemical-resistant nitrile gloves, safety glasses or chemical splash goggles, and closed-toe footwear. High-alkaline products add full arm coverage and face shield for splash risk. Solvent-based products used in enclosed or poorly ventilated spaces require respiratory protection — a half-face respirator with OV/P2 combination cartridge as a minimum — plus adequate ventilation. Check the SDS PPE section and the product hazard classification before use. Do not substitute latex gloves for nitrile where solvent resistance is required.
What are the Australian WHS requirements for solvent degreasers?
Under the model WHS Act and Safe Work Australia's Workplace Exposure Standards for Airborne Contaminants, PCBUs must assess solvent exposure risks, implement the hierarchy of controls (substitution to water-based chemistry preferred), and ensure airborne concentrations remain below the applicable TWA and STEL limits for solvent components. Specific obligations include: current SDS accessible for all hazardous chemicals; adequate ventilation or local exhaust extraction; PPE provision and training; flammable storage compliance under AS 1940:2017; and a hazardous chemicals register. Chlorinated solvents including TCE require biological monitoring for exposed workers.
Can I use degreaser on electrical equipment?
Standard industrial degreasers — both water-based and most solvent-based — should not be used on electrical equipment. Water-based products are conductive when wet and will cause short-circuits. Most general solvent degreasers leave a thin residue film. The correct product for electrical and electronic equipment is a purpose-formulated electrical contact cleaner — fast-evaporating, non-conductive, and residue-free. Products such as CRC Contact Cleaner or equivalent are designed for PCBs, connectors, switchgear, and motor windings. Never apply any product to live high-voltage equipment — always de-energise, lock-out/tag-out, and allow adequate discharge time before cleaning any electrical component.
What is a food-grade degreaser?
A food-grade degreaser is formulated to meet NSF International standards — or equivalent under HACCP food safety programs — for use in food processing and food preparation environments. NSF A1 designation covers incidental food contact; NSF A2 covers no food contact (cleaning between food production runs where residue would not contact food). Food-grade degreasers are free of food-contact hazards, rinse cleanly without leaving residue that could contaminate food, and are required under most food safety management systems for any equipment that contacts food ingredients. Using a non-food-grade degreaser in a food processing environment is a food safety compliance breach regardless of how well the surface is rinsed.
How do I safely dispose of used degreaser and contaminated rags?
Disposal requirements depend on the formulation. Used water-based degreaser solution emulsified with oil cannot be discharged to stormwater — it requires licensed trade waste disposal; check your local council requirements. Solvent waste is classified as hazardous waste under state EPA regulations and must be collected by a licensed liquid waste contractor. Solvent-soaked rags carry spontaneous combustion risk — store in a sealed metal bin partially filled with water, and empty daily via licensed waste disposal. Do not place solvent rags in open bins or plastic bags. Always refer to the product SDS for specific disposal instructions.
Is WD-40 a degreaser?
WD-40 original formula is primarily a water-displacing lubricant and corrosion inhibitor — not a degreaser. It contains a light petroleum distillate carrier that can loosen light contamination, but it leaves an oily residue. Using WD-40 original formula to degrease a surface before lubrication, adhesive, or welding is counterproductive — you are adding a lubricant film, not removing one. WD-40 Specialist Degreaser is a different product — a purpose-formulated water-based degreaser with no residue — and is appropriate for degreasing. Read the label carefully. The original blue-and-yellow WD-40 can is not a degreaser.