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.
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/// 2004 Silvergrey M3 · Coupe · 6MT · Slicktop · zero options
/// 2011 Jerez/Bamboo E90 M3 · DCT · Slicktop · IG: @na.s54
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