You can buy a special headlight polishing kit. It will contain a hard buffing wheel and some special compound. It will work, but the part that is oxidizing is the "hard" layer of the headlight. Once you remove the oxidation, the coating is gone too. Basically, it will continue to pit with road debris.
I use Flitz brand metal polish. Metal polish? Flitz brand polish works on any non-porous surface. It has no abrasives and it works great on headlights.
Thanks a million. I will definetely try these produsts. My lights are not that bad but I want to catch the problem before I have to purchase a new assembly to achieve the look that I want.
I should add, anything you use that takes off the oxidation is taking some part of the hard coating off. It is a catch22 situation. But, you use a Flitz type of product or even some Meguiar's plastic polish, you can keep the headlights from looking yellow.
I don't think the problem is that big a deal on MBZ cars. If you look in your local parking lot, look at mid-nineties and earlier Ford products, like the Thunderbird. There you will find lots of yellow lens. Garaged cars probably would far better too.
Note, I am not Ford bashing, plenty of other makes of the same era are doing the same thing, just using the T-bird as an example.
The European-spec headlights which look identically the same to the US-spec, are made of GLASS not the "US-spec-will-fog" plastic. So they always look new and fresh.
Try to buy these from ebay.de or off the internet.
Case in point:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&category=44243&item=7902320 336&rd=1
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