Unblackout the lights
#5
220 to remove, step up to 400, then to 800, then wetsand with 1000 then 2000 grit. They use some rubbing compound (3m is good) and a towel and just buff it by hand. If you take your time it shouldnt take you more than 2-3 hours.
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#8
Dont clear them, its not necessary whatsoever. Unless your just looking for a way out of wet sanding and using rubbing compound.
Even if you clear them its good to wet sand and use rubbing compound after they dry (if your using rattle can). Not to mention some rattle can clear is known for yellowing after a couple years in the sun. Not worth it.
#9