I've asked this before and I'll inquire again - What is the best method of removing grease/oil stains from black-top driveways? I've started with cat litter to absorb as much as I could. Then, I would dose the stained area with dish detergent and let that soak in a bit before hosing it down. The best result is about 88-90% effective. Don't use a pressure washer for it will leave unsightly lines on your driveway from where you aimed the water jet. Any other remedies out there?