Doesn't the ARC have AR coating?
"LED optics protected by new .092" AR coated, scratch resistant LEXAN lens"
If you take any polish to that lens, you'll polish the AR (anti-reflective) coating off, and suffer a 4% drop in light output as a result. If you polish the other side, you'll loose another 4% of your light, for a 8% total.
Seems a better option is to buy a stack of replacement lenses.