clean them with hot soapy water, then wipe with rubbing alcohol. Dry thoroughly with microfiber towel.
Take 800 grit and scuff lensed up, but go left to right, not in circles and not up or down. rinse off. take 1500 grit sandpaper and gently sand until lens is smooth (remember go in 1 direction).
dry off lens, rub down with alcohol, dry again.
spray lens with VHT nightshades until desired darkness is achieved. allow to dry for 12 hours. take 2000 grit and hold lens under faucet with cold water. 2000 grit, and gently wetsand all dirt out of the lens.
respray VHT as needed. if no VHT needed, apply clear in light even coats until desired gloss is achieved.
allow 4 hours to dry, then repeat wetsand. respray clear as needed. apply thin layer of turtle wax and buff until shiny, wipe off with microfiber towel.