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Oxidation: When headlights are exposed to UV light, they oxidize. To prevent this, a clear top layer is applied to headlight lenses, but the coating usually wears off, and sun rays turn the hard plastic yellow.
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Flying debris: Road salt, gravel, and other debris that gets churned up as you go down the road take a toll on your headlamps. This wears down the surface layer on your headlamps, causing pits and scratches that contribute to their cloudy appearance.
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Dirt and chemicals: After some years on the road, the lenses develop a thin layer of dirt and chemicals. This thick coating dims the light from your headlights.
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Water vapor: Headlamps are designed with a watertight seal, although this seal can break due to wear and tear—condensation forms inside the lens, which is impossible to remove. The water droplets scatter the light beam, making nighttime visibility even worse.
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