Rust Spots RTM is a safer alternative for users and the environment, especially when compared to more traditional products that contain hydrofluoric, hydrochloric, oxalic and phosphoric acids! This clear formula has a light fragrance and attacks rust quickly and effectively. Professional, ready-to-use formula makes tough rust and corrosion spot removal easy. Use sparingly and in an inconspicuous test area first. Be sure to take action as quickly as possible once staining occurs. Once Rust Spots RTM is allowed to react with the stain, rust residue will break free of the surface and can be extracted or wiped with a sponge and water.