Remove Oil Stains From Cement?
 

My Accord is leaking oil, and I haven't found the leak yet. Now, I'm putting cardboard under it, when needed.

It left some stains on a driveway. I think the oil sat for about 2-3 weeks before I was able to get back over there. So it's probably soaked into the cement. I tried spraying brake cleaner, and it didn't seem to do anything. Then I took water, Dawn soap, and a deck brush and scrubbed it. The water turned dark, so it definitely picked up some of the oil. But once it dried, the stain remained.

Anyone know a good way to get an oil stain out of a driveway? Maybe a pressure washer would work? But I don't have one, so I'd probably have to rent one.