Bathtub and Sink Rust Stain Remover This multi-purpose rust stain remover powder safely and effectively works on most surfaces in and around the home including fiberglass, porcelain and acrylic. Iron OUT is ideal for removing heavy-duty rust stains from bathtubs, sinks, showers, toilets and more. Remove Rust Stains In Toilet Tanks Iron OUT is tested safe for use to remove rust stains from toilet tanks. Simply add Iron OUT directly to toilet tank, allow to set overnight then flush several times to clear the tank. Iron OUT also safely and…