What Steve said with the cat litter, (not the "clumping" kind. Pour a ring of litter around the spot(s) I used mineral spirits and poured lots inside the litter ring to soak into the oil spot for a few minutes. Add more if necessary, and soak it up with more litter. Sweep it around to soak everything up. Let dry. Repeat if necessary. I have used this method on large oil spots from a car that parked there for over a year, and today you cannot see anything!