Oil and fuel stains are among the most stubborn driveway marks, and the ease of removal depends significantly on how long the stain has been present and what the driveway surface is made of. Fresh stains can often be almost entirely removed; old oxidised stains on porous surfaces require more aggressive treatment and may leave a permanent shadow.

Treating Fresh Oil Stains

Fresh oil that has not yet penetrated deeply into the surface should be treated immediately. The first step is to blot or absorb as much oil as possible before it soaks in. Pour a generous layer of an absorbent material such as cat litter, fine sand, or proprietary absorbent granules over the fresh stain and leave it for at least 30 minutes, longer for larger spills. The absorbent material draws the oil out of the surface. Sweep up the saturated material and dispose of it. This step significantly reduces the volume of oil remaining in the surface before cleaning begins.

Degreasing

After removing the bulk of the oil, apply a heavy-duty degreaser to the stained area. Proprietary concrete or driveway degreasers are available from DIY stores and are formulated to break down hydrocarbon stains. Apply generously, work the degreaser into the stain with a stiff brush, and leave to dwell for the time specified on the product, typically 10 to 30 minutes. For a natural alternative, washing-up liquid or neat biological washing powder applied with warm water and agitated vigorously with a stiff brush is surprisingly effective on relatively fresh stains.

Pressure Washing

After dwelling, rinse the degreaser and stain away with a pressure washer. The combination of degreaser and pressure washing is the most effective approach for most driveway surfaces. A surface cleaner attachment, which uses a rotating nozzle in a hood, produces a more even result and avoids the streak marks that a hand lance can create on porous surfaces.

Treating Older Stains

Old oil stains that have oxidised and polymerised into the surface are more difficult to remove. Poultice treatments, where an absorbent material such as sawdust or diatomaceous earth is mixed with a strong solvent and applied as a paste to the stain, can draw older oil out of porous surfaces over several hours. Purpose-made driveway oil stain removers with solvent bases are more effective on old stains than standard degreasers.

Summary

Fresh oil stains should be absorbed immediately with cat litter or absorbent granules, then treated with a degreaser before pressure washing. Older stains require stronger solvent-based treatments or poultice applications. Pressure washing with a surface cleaner attachment produces the most thorough result. Sealing the driveway surface protects against future staining by reducing surface porosity.