Headlights are an everyday necessity for driving day or night. Luckily, learning how to restore headlights back to like-new condition is not a difficult task!  Foggy headlights are caused from plastic oxidation. This is when the heat and cold from the elements and vehicle diminish a clear film that is on the headlights from the factory. After the protective film is gone the plastic will start to react and discolor from the ele...