How to Remove Oil Stains From a Concrete Driveway

An oil stain on a concrete driveway looks like a surface problem. It isn't. Concrete is porous, and oil wicks down into the slab — sometimes millimetres, sometimes more — depending on how long it sat there and how hot the surface was when it landed. That's why a quick rinse with a pressure washer rarely clears an old stain. You have to pull the oil back up out of the pores.

Fresh spill? Act in the first hour

If the spill is still wet, pile cat litter, sawdust, or even dry sand straight onto it and let it absorb for a few hours. Sweep it off, repeat if needed, then move on to a degreaser. The difference between a fresh stain handled inside the hour and one left for a week is enormous — one usually lifts cleanly, the other needs real work.

The sequence that actually works on old stains

• Pre-wet the surface so the degreaser doesn't flash off.
• Apply an alkaline concrete degreaser at the dilution on the label.
• Let it dwell — 10 to 20 minutes, keeping it wet, never letting it dry.
• Agitate with a stiff-bristle broom to work it into the pores.
• Rinse with high pressure, ideally through a rotary surface cleaner so the pressure is even.
• Repeat on stubborn stains — two or three passes are normal on older oil.

When a home job isn't going to get there

Deep, old oil — hydraulic fluid, gearbox drips, a car that's been parked in the same spot for a decade — often won't come fully clean with a garden-hose pressure washer. A commercial machine running a rotary surface cleaner delivers even pressure at the right flow rate, and paired with the right degreaser, it lifts what a domestic setup leaves behind. That's the core of professional driveway cleaning.

What to do about staining after the clean

Once the driveway is properly clean, sealing it keeps future oil, rubber and leaf tannin on the surface where you can wipe or wash it off instead of soaking in. A penetrating concrete sealer doesn't change the look of the slab and makes every future clean shorter and easier. It's one of the cheapest ways to protect a driveway long-term.

When to stop

Some stains don't fully disappear, and pushing harder isn't the answer. If a stain has been in the slab for years, the realistic outcome is usually a big reduction in visibility rather than total erasure. Knowing when to stop, rinse, seal and move on is part of doing the job properly.