Unclear, hazy, foggy, and yellowed headlight lenses are responsible for numerous sudden collisions on the road today. The problem is caused by Ultra Violet rays of the sun oxidizing the polycarbonate plastic that makes up the outer lens of the headlamp. Some headlight restoration systems only polish the oxidation off, which is a temporary fix. It will return just like tarnish on your fine silverware. It’s only a matter of time.