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How can I remove stains from concrete (garage/driveway)? The stains are most likely either oil, gasoline, or transmission fluid.

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There are lots of concrete cleaning products on the market, but I have had good luck with a 1 gallon solution of 1/4 bleach, 1 cup TSP and 3/4 water. Assuming you are talking about a driveway or garage floor, I would pressure wash the area first to get off the surface crud, then lay on some of the solution and let it set 5 mins or so. Scrub it down with a stiff broom and power wash again. Repeat this as necessary.
As a last resort, you can also use some muriatic acid, but test a small area first to be sure it doesn't effect the color too much.

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    TSP is a non-sudsing powdered Trisodium Phosphate compound that is formulated for heavy duty cleaning. (For anyone who had to look it up as well.) – JYelton Jun 19 '11 at 20:58
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If they are stains that just happened, i usually use sawdust or kitty litter. These soak it up nicely. If they have been there for a while, it may be too late.

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