Blot the spot with an absorbent cloth to remove as much of the oil as possible.
Sprinkle clumping cat litter over the spot to soak up the remaining oil. Allow the cat litter to remain in place for about half an hour.
Sweep up the cat litter and dispose of it in the trash.
Put on protective goggles and rubber gloves. Fill a container with 1 ounce trisodium phosphate, 1 cup clumping cat litter and 1 cup water. Use a paint stir stick to combine the ingredients until they develop the consistency of paste.
Spread a 3/8-inch layer of the paste over the oil spot. Allow it to remain in place for 24 hours.
Loosen the dried paste using a paint scraper. Sweep it up and dispose of it in the trash.
Scour the area with a nylon scrub brush and wash away any remaining paste with a garden hose.
Repeat Steps 4 through 7 until the oil spot has been completely removed.