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If the headlamps are made of plastics, it can only last for a short period of time after polishing it. I would strongly suggest to change to glass headlamps. I am using plastic crystal headlamps and mine has turned yellowish. I use a scourer (those green scrubbing thing with rough surface) to scrub the headlamps and it works. But after maybe about 1 month or 2 months, it will start to turn yellow again.
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