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This concentrated blend of acids and detergents allow this product to tackle really tough jobs. It removes rust, lime, and scale from all metals and any rust-stained surface. Since it does not contain harsh muriatic or hydrochloric acids, it will not harm floors or drains. Besides being designed to remove soap scum and body oils from shower stalls, restroom floors, and swimming pools, this product is also formulated to remove water minerals and lime carbonates. This mild acid detergent cleans and brightens aluminum, magnesium, stainless steel, copper, and chrome. In addition, it can also be used to prepare steel or aluminum for painting.