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Do not use brake fluid, sandpaper, aggressive polishing compound or anything of that sort. What has turned yellow is the top layer of the anti-scratch, anti-UV hard coating applied to the face of the lens during manufacture. If you use a physically or chemically aggressive means of cleaning the lens, you'll scrub off all the coating and then the base plastic will be left exposed; it will quickly degrade far worse than before. Avoid the overpriced headlamp "restoration" kits. The "protectants" or "coatings" they claim will renew the anti-UV protection are useless. Buy a spray can of brake cleaner -- get the CRC brand called "Brakleen" with the red label, not green. Also buy a small bottle of clearcoat-safe car polish. Apply the brake cleaner liberally to a soft clean cotton rag and use it to gently wipe the yellowed front surface of the headlamp. Turn the cloth frequently as it becomes dirty. This works because the oxidized coating is soluble in brake cleaner, but the good layer underneath is not and so will remain intact and undamaged. This is not the case with a more aggressive technique or solvent (the good coating will be dissolved by brake fluid, for example, or scratched right off with sandpaper).

Once that's done, use the car polish in accordance with label instructions.

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