Another way to take greasy stains out of concrete is to first pour a pile of clay cat litter on the stain. Let it sit for several hours, then sweep it up. Then spread some powdered dishwashing detergent (the kind you put in the dishwasher) on the spot, and let it sit for about 15 minutes. Next, pour a little boiling water over the detergent, scrub it off with a stiff-bristled brush, and rinse well.
This solution isn't just for car grease- it'll work if you spill something oily on the concrete while you're barbecuing too!
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