Rust-Oleum Whink Rust Stain Remover Foaming Spray, 24 oz. is a powerful and effective solution designed to quickly dissolve tough rust stains on a wide range of indoor and outdoor surfaces. Featuring Active Cling™ Technology, this foaming spray clings to surfaces, allowing the formula to deeply penetrate and remove rust stains without the need for scrubbing. It is for use on showers, sinks, bathtubs, colorfast fabrics, carpets, vinyl siding, patios, and more. Safe for plumbing and septic systems, this rust stain remover contains hydrofluoric acid to effectively eliminate unsightly brown and yellow stains caused by iron in water. This makes it an essential cleaner for maintaining a fresh and clean home environment. Model Number: 349944