Salt is an unwelcome type of contamination on your vehicle. Salt can cause rapid corrosion and extreme dage to unprotected metals. It can also severely stain polished metals and create a matte look over the surface.
A finishing polish is often considered the last step in the polishing process. It is a very fine polish that has a low grade of cut but a high level of perfect finish. A finishing polish can remove oxidation, marring, very light swirls and some of the minor imperfections.
There are reasons why paintwork can turn dull. Oxidized paintwork, or UV-damaged paintwork. Oxidized paintwork can look dull and looses its shine. It doesn’t turn pale or looses its color, this would be UV-damage, not oxidation.
A traffic film is the term used to describe the fine layer of contaminants that cover a vehicle that has been used. The very film layer of contaminants lie on top of the car as a grey-ish film. Washing alone might not always be enough to fully remove this film.
Paintwork can, in some cases, become oxidized. Making it turn matte and slightly fade color. If untreated, it can eventually cause the lacquer and/or paintwork to completely fail. It is most common on red cars, but it can happen with every color.
Oxidation is the chemical process in which there is a chemical reaction that involves the moving of electrons. To be more precise, it means that the substance that is giving away electrons is oxidized. In simple terms it means that the surface of any object is affected when time goes by.