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Clay barring your headlights is the best thing you can do for headlights. Do not polish it or you'll ruin its clarity forever. Headlights cannot be polished because they are made out of poly-carbonate. The clarity of the plastic is set at the curing point. If you polish it, it will damage the top layer leaving a light haze. If you pour water over it, it causes the haze to turn clear. Just because it turns clear doesn't mean the fine scratches are not there. So even though a headlight may look new after a polishing session, actual light output is diminished.

If you clay bar your headlights however, it will take off a lot of the dirt that is blocking the light output. It will also restore some clarity. Buy yourself a bottle of ONR and then run to autozone and get yourself the surface prep mitt. So claybar is about the only thing you can do for headlights. Also, ur not suppose to wax headlights.
 

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Headlight Restoration -- TOGWT: Headlight Restoration

Cause

Over the years, the polycarbonate headlight lens on any vehicle are subjected to heat and humidity - high Intensity discharge (HID) bulbs also bulbs also contribute to the deterioration of the polycarbonate lens as they emit heat from inside the lens, heat from the engine bay, radiation heat and humidity from the atmosphere, depending on climate and season Ultra violet (UV) radiation degradation causes oxidation and the lens becomes hazy and yellow. Road salt is also a yellowing agent, and then there is the effect of high-speed collision abrasion from dust, road grit and insects.

Effect

All of the above will cause the lens to become opaque causing lack of available road illumination. Hazy headlights aren’t just a cosmetic issue; they’re a safety issue, too and replacing headlights can get extremely expensive, and is often unnecessary.
 
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