If you work in an auto shop, oil stains aren’t a question of if, but when.
The best way to remove oil stains in an auto shop is to apply a water-based degreaser, let it dwell for 15-30 minutes, scrub with a stiff brush, and rinse with hot water. For concrete floors, use Oil Eater undiluted on heavy stains. For work clothes, apply it diluted as a pre-treatment before washing. For carpet and upholstery, spray, blot — don’t rub — and air dry.
The key across all surfaces is to act fast, choose a solvent-free formula that’s safe for multiple materials, and never put clothes in the dryer until the stain is fully gone.
Read on for a more detailed guide on how degreasers work, where to use them, and step-by-step instructions for tackling oil stains on concrete, clothes, carpet, and more.
| Degreaser: A cleaning agent formulated to dissolve, lift, and remove oil, grease, and hydrocarbon-based contaminants from surfaces without damaging the underlying material. |
Degreasers work at the molecular level. Most oil and grease molecules are non-polar, meaning they don’t mix with water on their own. Degreasers contain surfactants, which are compounds with a water-attracting end and an oil-attracting end. When applied to a greasy surface, surfactants surround the oil molecules, break them apart, and suspend them in water so they can be rinsed away.
Water-based degreasers (like Oil Eater) do this without relying on harsh petroleum solvents, making them safer for users, surfaces, and the environment.
Oil Eater is in stock and ships free. Shop Oil Eater →
Degreasers are used almost everywhere in auto shops. Auto shops generate oil and grease contamination across multiple surfaces and materials daily.
Common applications include:
The right degreaser (properly diluted) handles all of these without the need for a cabinet full of different cleaners.
Oil stains on concrete are stubborn because concrete is porous. Oil soaks into the surface quickly, and the longer it sits, the deeper it penetrates. According to Concrete Network, the size and age of the stain will determine how aggressive your approach needs to be.
Fresh stains haven’t fully set yet, so act fast.
Pro tip: According to Allstate, hot water tends to work best when removing oil from concrete. It begins separating the oil from the surface more effectively than cold.
Older oil stains require a more aggressive approach:
Avoid harsh DIY chemicals like muriatic acid or bleach on decorative concrete because they can etch or discolor the surface.
Asphalt is more delicate than concrete. Start with less aggressive methods, like degreaser and scrubbing, before escalating. Heavy solvents can break down the asphalt binder and cause long-term damage. A water-based degreaser like Oil Easter is the safest choice here.
Act immediately — don’t let the stain dry. According to Whirlpool, the sooner you address an oil stain on clothes, the more likely you are to remove it completely. Heat from a dryer will set the stain, making it even more difficult to remove.
See also: The Best Hand Cleaner for Mechanics and Auto Shops →
Set-in stains require a bit more persistence.
For mechanic’s uniforms dealing with heavy black grease, a purpose-built degreaser concentrate is often more effective than dish soap alone.
Grease on carpet needs a careful hand. You’re working with fabric that can be damaged by over-wetting or harsh scrubbing.
Always test your degreaser on an inconspicuous spot before applying to carpet or fabric, especially if it’s a delicate or dark material.
Use what the pros use. Get Oil Eater at Keller-Heartt (FREE shipping!) →
The best degreaser for auto shops is Oil Eater Cleaner and Degreaser. It is a water-based, biodegradable formula that checks every box for automotive environments.
|
Feature |
Benefits for Your Shop |
|
No petroleum solvents |
Safe on painted surfaces, skin, and most materials |
|
Biodegradable formula |
Easier disposal, safer for the environment |
|
No harsh acids or abrasives |
Won’t etch concrete or damage equipment |
|
Fresh scent |
Leaves the shop smelling clean, not chemically |
|
Highly concentrated |
Dilute for light jobs, use undiluted for heavy grease |
|
Versatile application |
Spray bottles, pressure washers, parts washers, steam cleaners |
Not all degreasers are built for shop environments. Many contain harsh petroleum solvents, strong acids, or abrasives that can damage surfaces, put workers at risk, or create disposal headaches.
As we’ve covered in our Top 5 Advantages of Oil Eater Cleaner and Degreaser article, Oil Eater delivers powerful cleaning performance without the downsides of solvent-based products.
|
Application |
Dilution Ratio (water:degreaser) |
|
Light cleaning (tools, surfaces) |
10:1 |
|
General shop cleaning |
5:1 |
|
Heavy-duty degreasing (floors, engines) |
1:1 or undiluted |
Oil stains are constant in every auto shop, but they don’t have to be permanent. Oil Eater is always in stock at Keller-Heartt in a range of sizes, including bulk options. And like everything we carry, it ships free.
Shop Oil Eater Cleaners and Degreasers →
Need help choosing the right product, size, or dilution ratio for your operation? Our team is here to help. Reach out online.
It depends on the formula. Solvent-based degreasers can strip wax, dull clear coat, and damage paint with prolonged contact. A water-based, solvent-free degreaser like Oil Eater is much safer. It won’t attack automotive finishes when used as directed.
That said, always avoid soaking painted surfaces and rinse thoroughly after application.
Solvent-based degreasers dissolve grease using petroleum or chemical solvents. These are powerful but potentially hazardous to surfaces, skin, and the environment.
Water-based degreasers use surfactants to lift and suspend grease so it rinses away cleanly. They’re safer for workers, better suited for a wider range of surfaces, and easier to dispose of.
For most auto shop applications, a concentrated water-based degreaser delivers all the cleaning power you need without the added risk.
For heavy automotive and industrial grease, a highly concentrated water-based degreaser used undiluted — like Oil Eater at full strength — can handle the toughest buildup on shop floors, engines, and equipment. Solvent-based degreasers are technically more aggressive, but that aggression comes with tradeoffs: surface damage risk, fume exposure, and stricter disposal requirements.
Yes. Oil Eater is non-toxic, biodegradable, and free of harsh acids, abrasives, and petroleum solvents. It’s safe for use around workers, safe on most surfaces, and won’t create hazardous waste disposal issues. Basic precautions still apply when working with any concentrated cleaner: gloves and eye protection are recommended, and ensure good ventilation in closed spaces.
The older and more set-in a stain is, the harder it gets to remove, especially on porous surfaces like concrete where oil continues to absorb deeper over time. On concrete, multiple degreaser applications combined with a pressure washer will remove most stains. On fabric, the dryer is your enemy because heat permanently sets oil stains, so always air dry until you’re certain the stain is gone.
Fresh oil stains can almost always be removed permanently.
Dawn dish soap can work on light or moderately set stains, particularly on clothing. But for heavy automotive oil, especially on concrete or in work uniforms, it often falls short on its own. A purpose-built degreaser like Oil Eater is significantly more concentrated and formulated specifically for industrial-grade grease.
A comprehensive guide to best practices for Oil Eater and cleaning solutions in fleet, automotive, and industrial applications.
Brake cleaner is a powerful solvent and has many uses beyond just extending the life of brakes. Here are some other ways to use it.
Extend oil life and avoid costly mistakes with smart motor oil storage practices every auto shop needs.
Subscribe to the Keller-Heartt blog so you can sharpen your industry knowledge, gather helpful tips, and stay informed about changes or updates in the oil provider landscape.