Cant clean headlight!

[sprocket]

Hiyas. Inside of my headlight was dusty after not having a dusty cap for a few months, took it all apart to clean, but it just wont rub off or clean off - the dusty marks that is.

What do i need to get it off without scratching it!?

 

[SMIT]

i would recommend so wax & grease remover. And depending on where it is i would say maybe some 2000grit Wet & Dry?