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How to Remove Oil Stains From Concrete

Updated August 29, 20263 min readTime needed: 1–2 hours, plus overnight for old stains
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Short answer: Fresh oil stains lift best with an absorbent material like cat litter or baking soda left overnight, followed by a degreasing dish soap scrub. Old, set-in stains need a dedicated concrete degreaser and more scrubbing time.

How much has already soaked in?

Stain ageWhat's happenedRealistic approach
Hours old, still dark and wet-lookingOil is mostly sitting on the surface, hasn't penetrated deepAbsorbent material overnight, then one degreaser pass
Days to weeks oldOil has soaked into the concrete's surface poresAbsorbent material, then 2–3 rounds of degreaser and scrubbing
Months or years old, dry and darkOil has penetrated deep into the concreteMultiple degreaser rounds; a poultice or commercial stain remover may be needed; some discoloration can be permanent

The absorbent-material step matters most for stains still in the first row — once oil has had weeks to migrate deeper into the concrete's pores, absorbing surface residue does less, and the degreaser scrub is doing most of the real work.

Common Symptoms

  • A dark, greasy patch on a garage floor or driveway
  • Stain that darkens further when it rains or gets wet
  • Slippery texture on the stained area

Likely Causes

1. Motor oil, transmission fluid, or other automotive leaks

Concrete is porous, so oil from a leaking or dripping vehicle soaks into the surface rather than sitting on top of it.

2. Grill or cooking grease drips

Grease from an outdoor grill or fryer can stain a patio or garage floor in a similar way to automotive oil.

3. Stains left untreated for an extended period

The longer oil sits, the deeper it penetrates the concrete's pores, which is why older stains typically need stronger treatment.

Safe Checks You Can Do

  • Test any degreaser on a small, inconspicuous area of the concrete first to check for discoloration.
  • Check whether the concrete is sealed or unsealed, since sealed concrete resists staining better and cleans up more easily.
  • Confirm nearby plants or grass won't be affected by degreaser runoff before rinsing.

Step-by-Step Solution

  1. 1

    Absorb fresh oil first

    For a recent spill, cover it generously with cat litter, sawdust, or baking soda and let it sit for several hours to overnight, absorbing as much oil as possible before cleaning.

  2. 2

    Sweep away the absorbent material

    Sweep up the litter or baking soda, disposing of it in the trash (not down a drain).

  3. 3

    Apply a degreaser

    Pour a concrete-safe degreaser or a strong dish soap directly onto the stain, working it in with a stiff-bristled brush in a circular motion.

  4. 4

    Let it dwell, then rinse

    Allow the degreaser to sit for the time stated on its label (typically 10–15 minutes), then rinse thoroughly with a hose.

  5. 5

    Repeat for old, set-in stains

    Older stains often need 2–3 rounds of degreasing and scrubbing, and may benefit from a dedicated commercial concrete oil-stain remover for full results.

What Not to Do

  • Don't use a pressure washer alone expecting it to remove set-in oil — it can spread the stain into a wider area without a degreaser first.
  • Don't pour used degreaser or oil-soaked absorbent material down a storm drain — dispose of it properly per local regulations.
  • Don't use straight bleach on oil stains — it doesn't break down oil and can discolor the concrete.

When to Call a Professional

  • The stain has been present for years and DIY degreasing isn't making visible progress.
  • The oil source is an active leak from a vehicle — get that repaired first, or any cleaning will be undone quickly.
  • You're dealing with a large-scale spill that may need professional environmental cleanup, especially near storm drains.

Frequently Asked Questions

Does WD-40 remove oil stains from concrete?

Some people use it to help loosen very old, dried stains before degreasing, but it isn't a primary stain remover on its own and adds its own oily residue that still needs cleaning up.

Will a pressure washer alone remove an oil stain?

Not reliably for anything beyond a very fresh, light stain. Oil needs to be broken down chemically with a degreaser before pressure washing rinses it away.

How do I stop new oil stains from forming?

A concrete sealer applied to a clean, stain-free surface makes future spills much easier to wipe up before they soak in, and a drip pan under a leaking vehicle prevents new stains entirely.

Safety warning

When using degreasing chemicals, wear gloves and eye protection, work in a ventilated area, and follow the product label's disposal instructions rather than rinsing concentrated chemicals into storm drains.

Home Solutions Editorial Team

Updated August 29, 2026. How we write guides

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