Tooth Paste with a disk polisher pad will kick the *** out of anything out there hands down...IMHO.....Then you finish the process with a good plastic polisher.

 

+1 for the toothpaste.

You'll need a toothpaste (doesn't have to be crest, it just CAN'T have silica in it) without whitening.

These toothpastes are difficult to find in some areas, because almost all of them have silica or hydrated silica. This will scratch and ruin your lenses.


I used regular white toothpaste on my D last summer and the lights look brand new (so much better than most 03's). Also just did my gf's 98 beetle today, and it looks great too.
That's the cheapest solution and I've never seen a kit do a better job. Just be sure to finish off with some wax.

 

Sorry for no real info yet, just signed up...

But I have professionally detailed for over 15 years, and the best way to do your composite lamps is with a wet sand of 800 grit (keep the lamp very wet, glass cleaner works best for this...) then take and wet sand with 1000 - 1200 grit paper. again, keep it very wet. Once done, wipe them dry (yes, they will be very opaque, but we are not done yet...

Once the composite lamp is dry, buff with buffer at low speed with a decent wax (we always used 3M for this, in the black bottle) wipe off excess and viola! Good luck...

 

Essentually all your doing is grinding the top layer of oxydized plastic off with an abrasive, smoothing it out then polishing the plastic with a quality wax. The more time and effort you put into buffing and polishing, the better your results will be.

 

The most important part, though, is that if you do wetsand, you take it to a shop and have the lenses sprayed with clear coat (this is like $50).

If you don't do that, they'll get nasty again because you've scraped off the UV coating. If you just clean them with toothpaste, this coating won't be gone and you don't have to have them redone.

If you wetsand and don't get them sprayed, just expect to keep repeating the process every 6 months or so...