Star brite® Rust Stain Remover, 22 oz Spray. Eliminates unsightly rust stains from boats, RVs, exterior walls of homes, etc. The formula begins working on contact, dissolving the oxidation. * 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.