My right side front lens is starting to do this.
When I finally do use the 3m stuff, I plan on using "ProtectAll" over it.
It has UV blocker, and is good for plastic, clear coat leather almost any surface you can think of.
Fiberglass so its good for the boat too.
I want my seal beams back, to much plastic being used today.
Lee

 

i had to buy new headlights for mine because the reflective surface was chipping away.....would it work on the turn signal lenses too so i wouldnt have to buy new ones

 

The plastic polishes will work on parking lights as well, unless they are textured - that would be tough to work with. I hear the key to long term success with these polishes is to clearcoat with something UV inhibiting, or else they cloud up again pretty fast.

I usually use Meguiars "cleaner wax" on headlights, and it looks great for a while - then just do em again real quick to freshen up if needed weeks later. It has a very mild abrasive that also is GREAT for minor scratches and/or paint scuffs for example from another car's door or if you scrape something. Takes some elbow grease but I have had good success with it.