It's probably to late as you were going out to do it last night, but here's some helpfull info for your tool bag of tricks. "Natural Enzymes". We use a product called Bio-Concrete Cleaner. It actually eats petroleum based products. (don't get it on asphault). Continues to work every time it gets wet. Getting rid of oil stains with cold water will take a lot longer, using a lot more detergents,and will not do as good a job.But it can be done. Hope you made out OK last night,and got paid. Nothing like being an unpaid entertainer.