There's this green product that they have at Home Depot, it's purple and comes in a 2 liter jug. Green was in the name, can't remember the exact name of it, but it's biodegradable.
I used it on a huge 5X5 at least oil spill in two separate spots following the instructions on the bottle, and it cleaned it so well you wouldn't even have known that a drop of oil was spilled. If I recall correctly it has enzymes that break down the oil.
Basically you dilute it, and pour it on it, let it sit, and then hose it off shortly after.
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