How Long Can Yellowed Headlights Last After Polishing?
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Headlights can last about a year after polishing for yellowing. Over time, car headlights become less bright, and the yellowing of the lens becomes noticeable. This phenomenon is particularly evident in ordinary halogen headlights. Poor headlights result in reduced lighting effectiveness, a smaller illumination range, causing inconvenience for nighttime driving and lowering driving safety. Reasons for Headlight Yellowing: Generally, the glass cover of headlights on most car models is made of high-grade polycarbonate through injection molding. This material features high hardness, strength, toughness, UV resistance, and excellent light transmission, making it an outstanding lens material. However, prolonged exposure to the sun's UV rays can cause the headlight lens to oxidize and turn yellow, or even layer and crack. Maintenance Methods for Yellowed Headlights: Washing headlights with soapy water is suitable for lenses with low oxidation levels. Every two months, take a small piece of household laundry soap or hand soap, dissolve it into soapy water, and use it to clean the headlights. Using a high-density car wash sponge can effectively remove dirt and dissolve the oxidized layer, keeping the headlights clean and free from yellowing.