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A crystalline powder designed as a fast-acting, weak-bleaching solution and polishing compound. Removes stains from fiberglass surfaces as well. It can remove superficial water and rust stains or spots from marble and wood. It creates a powdery mix when combined with water, mix 1/2 cup powder to one gallon of water. Fine sandpaper or buffs may be used to apply oxalic acid and buff the surface.