Whink Rust Stain Remover Foaming Spray quickly and easily dissolves tough rust stains on indoor and outdoor surfaces. The powerful foaming spray with Active Cling Technology clings to surfaces to dissolve stains without scrubbing, then easily rinses away. Remove unsightly brown and yellow rust stains on showers, sinks, bathtubs, colorfast laundry, vinyl siding, patios and more. Iron in water oxidizes when exposed to air and creates brown or yellow stains on showers, sinks, and toilets. Outdoor sprinklers and faucets can lead to rust stains on siding, patios, and sidewalks. The iron can also accumulate on laundry causing yellowing or stains. Whink Rust Stain Remover Foaming Spray is a powerful cleaner that dissolves these iron and rust stains without the need for heavy scrubbing. The fast-acting formula has a minimal odor and is safe for use on most surfaces.