Any solvent based cleaner will let the oil go deeper into the
concrete. If you have a power washer or high pressure on your
garden hose, soak the area with Simple Green, engine degreaser
(from an auto parts), or one of the citrus based cleaners. I'd
let it soak overnight with plastic or a bucket over it to keep it
from evaporating. Go after it the next day with water, scrub
brush, stiff broom, putty knife, and more of the cleaner. This
may be a good quitting point. If you want to try to get more of
it, place dry Portland cement on it. Put it on heavy. It will
absorb the oils. This is not a fast process and may need several
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