I like to use a water-soluable degreaser like Purple Power from Wal-Mart on oil or transmission fluid in driveways or wood. I buy the gallon container, and don't bother with the various sprays. Of course, this is in warmer weather.
Pour it on, scrub it back and forth with a broom, let it sit for 10-15 minutes, then hose it off. Let it dry, and see if a second application is needed.