I got some of that Mothers polish for plastic lenses. Comes with the blue ball you put on a drill. I was skeptical. Boy was I wrong. It took my clear under bumper turn signals and cleared them right up. they were very milky. I also polished my front medallion with it. Glad to see something works as advertised. PICS dont do it justice.
Works great doesnt it. I do this at work for customers. Just need a foam buff pad and a die grinder. Regular cutting compounds and a sealer. If they are real bad scotchbrite or wet sand first. I actually fail cars on safeties if they are to yellow. Charge .5-1.0 hour labor. Customer can see at night time again and I make some extra money. Been doing this for years now. Long before the kits came out. I find they need to be done about every year after. The occasional coat of wax seems to help in between.