My 03 300M has the clear headlight lenses. They have always been clear, but recently I noticed a roughness developing on the surface … almost like something has attached or melted to it … just rough spots in certain places. What can I do to clean and keep these lenses clear? Thanks!
Check your local auto part store. There are some cleaners formulated to clean clear lenses. I have never used them, but understand that they work.
If they are dark specks, try bug and tar remover, otherwise like roy says, above.