There quite a few threads in here about it, most reccomend T-cut and polishing, there was also a mention of what type of protector to put on when finnished T-cutting, but I cant find it anymore. Have a look through the prvious threads, just type in headlight in the search icon above and see what comes up.
Mine were looking a bit yellow and I made a mistake of asking my big brother who works for a light manufacturer. After a lengthy explanation its apparently due to UV light. I used T cut on mine and brought them up like new. Each time I polish the piant work I do the lights at the same time
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