Sorry about this but I don't know who else to ask. My '87 GL has developed a small power steering leak. Drops a spot about the diameter of a tennis ball when it is parked after use. Bad enough, but how do you get the stain off the concrete driveway? I have tried two different driveway cleaners and several home brews but nothing seems to work. Forget the $450 for the power steering, the driveway just cost me $6000 ! Your help please.