Use Boeshield rustfree for the fast and easy removal of rust and stains! For light rust on steel or cast iron, spray rustfree on a rag and wipe surface. Do not spray directly on surface, as it may cause spotting. For heavy rust, spray directly on rusted surface and scrub with Scotch-Brite pad. Wipe off and repeat if necessary. Rustfree works best above 70 degrees F. Rustfree is acidic and should be used with care. Use Boeshield T-9 after cleaning with rustfree to protect bare metal surfaces.