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Spray GUNK or Pour bottled coke over the oil. Sprinkle laundry detergent over top. Scrub with a stiff bristle broom or brush. Let it sit for a couple hours. Rinse off with clear water.
Same sort of thing happened on my parents driveway eons ago. I used some Gunk (from a tin not the spray) - as James said, scrub with a brush & let it sit, then rinse. Repeat as necessary.