Best on rust! powerful gel clings to dissolve rust! Bathroom. Kitchen, Carpet, Fabric & more! Iron out rust stain remover is a powerful spray gel that clings to rust and dissolves it on contact. Ideal for vertical and hard-to-reach surfaces, iron out spray is specifically formulated to easily rinse away the toughest rust stains caused by hard water without scrubbing. It is safe to use on:; porcelain; tile fiberglass colorfast fabrics & carpeting; chrome. Concrete; plastic glass. For heavy - duty stain below the water line or to clean iron build up in water softeners, try iron out. Rust stain remover powder