Surface rust is actually one of the main reasons why we invented Sheen Genie metal polish and cleaner. The surface rust typically comes from road salt, chemicals, acid rain, mud, but mostly from just being exposed to oxygen and moisture. Rust is just a mild form of corrosion from oxidation. How our formula works is by penetrating the surface rust down to the connecting layer of buildup. It releases the bonds of the rust from the smoothest parts of the metal, therefore exposing the original surface once again. Sheen Genie remains moist and the rust absorbs the moisture from the compound much more quickly than it will re-oxidize, keeping the surface clean and free of corrosion. Typically you’ll find optimal results from just the first application, however, if some of the corrosion remains, just give it a second application and you should be very satisfied with results. You’ll notice a new, smooth, glossy surface that should bring a smile to your face. Click this link to learn more about what causes metals to oxidize or rust.