[Joel-Box-ster]

1) Check your local Penny Saver ad. and craigslist there some shops advertising refinishing and straightening bend wheel.

2) Try cleaning it with a small amount of cleaner/wax, if the stain is inside its probably an glass cleaner over spray seeped from the side. I believe its plastic tap it with your fingernail, plastic makes louder ticking sound.

3) Headlight restorer (liquid) might work, there's one that does not require sanding forgot what brand its in a small blue bottle.