The internal chrome tends to come off with the slightest touch so i'd just stick to rubbing down the external lenses with wet & dry / cutting compound / polish
Either that or a decent pair of 2nd hand ones off one of the breakers on here
The reflectors aren't an issue, just the lenses. I've had them apart before, when I replaced the adjusters. Doing that to polish
both sides of the lens is something I can do tonight.
As for used, I don't think mine are much worse than any others I've seen recently, plus there is the transport/ adjuster issue to deal with. If I replace them, I would rather spend a bit extra and have new, rather than have this problem again in a couple of years.
Grotty plastic lenses are common; mum's Focus lights are in a terrible state, and I spent half an hour yesterday compounding the lights on the company Connect. This was never a problem with glass lenses.