Hi Chriswright, Noticed no one commented, late then never. On another forum someone used wet and Dry, then used Toothpaste to polish. http://www.cliosport.net/forum/showthread.php?651229-headlight-restoration-how-to-with-pics Hope this helps a little.
Toothpaste is actually quite a good polish for plastic, used to use it to remove scratches from eye glasses
http://www.cliosport.net/forum/showthread.php?648981-headlight-correction-and-a-polish-) this is what I done on my old 172 hope it helps chris