how do i remove power steering fluid stains from concrete?

my wife's car blew a hole in one of her power steering hoses. it has already been replaced and she's good as new. however, she was parked in the driveway at the time i noticed. i didn't want her to move cuz i didn't want to burn up the pump, so i changed everything there. needless to say, there is a giant stain in the driveway now, very easily visible from long distances. i normally park my old yota in that spot, and i can't have my neighbors thinking my baby leaks a lot of oil.