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What works for me is putting down cardboard to catch any drips when I'm working on the car and using a good oil catch pan.
I haven't found anything that will take oil stains out of concrete and leave it looking the same as the surrounding area. Especially on a rough and porous driveway concrete.
Garage floors with a smoother surface are easier to clean. I generally use simple green and a wire brush immediately after the spill.
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