Having dealt with this problem a few times on a few cars I'm pretty confident in the following:
When new there is a coating on the lenses.
You need to sand this off, start with a fairly coarse wet and dry (say 500 grit) and work down to 1500.
You can then polish the lenses with all sorts of things, like T-cut, metal polish, car wax polish and they'll come up great.
However if you polish them they will go dull (in the UK) in about 12 months.
If after the 1500 grit you lacquer them (mine were done with the normal clear lacquer used by bodyshops) they'll come up like new, even though the 1500 grit finish looks dull before the lacquer. This will last for years.
I guess the trick is to prep them up then just ask a body shop to give them a quick blast of lacquer next time they're painting a car.
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Topic: HeadLight Dulled (Read 3219 times)