I suckered in on a used above ground pool with a salt water system. The guy finished putting it up and filling it with water on Friday. He is coming back today to hook up all the filters and the salt water system. Evidently whoever he bought it from had stopped taking care of it and it had gotten nasty. (They put in a brand new liner.) The stairs that came with it are gross. Where the water line was at they are nasty and green and all over they feel like they are covered in sand. I have ruined several of those scratch pads trying to clean them up. Does anyone have any suggestions for how to get the nasty stuff off of them or should I just buy a new set? They are in good shape - except for the yucky stuff.