Metal furniture feet and corroding air ducts can leave behind unsightly rust stains on commercial and residential carpets. If this staining builds up in the fibers, your average detergent or spotter can’t lift the stain alone. A tough stain takes an even tougher cleaner, and Rust-Off is the toughest on rust. Using a new, Fluorine-free formula, Rust-Off has the power to remove stains on carpet and hard surfaces without using any of the dangerous fluoride chemicals.