Rust Stain Remover Spray 22oz Good For Fiberglass & Metal StarBrite 89222 Rust Stain Remover is the best way to eliminate unsightly rust stains from boats, RVs, exterior walls of homes or wherever else they may form. The formula begins working on contact, dissolving the oxidation that causes these stains. Easy to use; spray directly onto stained area and rinse off; no heavy scrubbing needed. Easy to use spray on formula. No rubbing or scrubbing required. Safe for use on fiberglass, metal and painted surfaces. Removes rust drip stains and sprinkler rust deposits. Contains no harsh acids Great for cleaning corrosion stains caused by metal hardware, nuts, bolts and other marine fittings Specially formulated for marine and RV use; Also ideal for removing sprinkler stains