I would be tempted to try one of the headlight polishing kits in a small spot to see if that would work.
CUSTOM WHEEL & TIRE PACKAGES
$125 LED LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBURETORS - $249 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS - $425 DELIVERED
Email - email@example.com