[TboneS54]

I never bother with polishes made for a specific surface, I just use a fine polish (my favorite is Griot's boss perfecting) with a soft-ish pad (like green or white LC CSSS).

You don't want to cut too deeply into headlight plastic as you'll remove the coating. For this reason, I wouldn't wet sand unless you're simply trying to get them too look as good as possible, but only for a short period as they will turn (like if you're buying new lenses soon).

Just a light polish with high speed is what I recommend for glass, plastic, piano black type finishes like window pillars.