This 10 lb. container of Super Iron Out is the leading all-purpose rust and stain remover and water softener cleaner. It cleans toilets, sinks, tubs, dishwashers, exterior surfaces and more. It cleans and maintains water softeners, and also whitens, brightens and removes rust stains from white clothing and fabrics. Super Iron Out is a reducing agent that chemically changes rust into a clear, soluble state that easily rinses away without scrubbing.