Though oil stains on asphalt are difficult to remove, you can try to scrub them out with a detergent and bleach or, as an alternative, with a commercial driveway cleaner, sold at home improvement centers. If you buy a driveway cleaner, be sure to get one that is made for asphalt; a concrete cleaner can damage asphalt. Follow label directions explicitly. But first, try household cleaner route:

1) Using a stiff, long-handled brush and a solution of trisodium phosphate (TSP) or phosphate-free substitute, scrub the stain.

2) Following label precautions and directions, scrub remaining spots with full-strength household bleach. Wear old clothes, rubber gloves, and safety glasses.

3) Rinse thoroughly with a hose.