Hi Bojan, there are polishing kits available from varioius outlets for reconditioning the polycarbonate lens of car headlights , that become "frosted" by UV and probably by being "sand blasted" after thousands of kilometres of driving. Have seen the kits for sale at Aldis', on Ebay, at Supercheap Auto etc and probably many more retail outlets.
https://www.supercheapauto.com.au/p/...it-17pc/385468
https://www.ebay.com.au/sch/i.html?_...570.l2632.html
May be worth a look to see if suitable for your needs. These kits may be too abrasive for optical gear but you could also try using a few grades of rouge for polishing.