Lots of good tips already, but I want to put in another plug for Simple Green. As a last step I spray some Simple Green on the area. It has enzymes that digest any remaining oil, over time.
Contractor's trucks and delivery vehicles always seem to be dripping.
When a visitor leaves an oil drip or a puddle on my driveway I blot up what I can with a paper towel, then just hit it with a spray of Simple Green and forget about it. The next time it rains or I happen to hose off the driveway, the stain is gone, or well on its way. A repeat treatment will speed the process, but no scrubbing is necessary. Easy and it works for me.
