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Customer said that he thinks this staining was from a golf cart battery. Probably from years ago, and he has never had the carport cleaned. I cleaned the carport with EBC and a cold water surface cleaner, then tried using F9 on the orange stains. First tried with half and half mix, and saw no...

Customer had a drain from an AC unit coming out on the ceiling of his front porch (??), and it rusted the slate tiles up. I tried using half water, half F9 and it didnt seem to do much. Used straight F9, sprayed a couple of coats on a tile, and still didnt see much change. Is there a trick to...