twood
Air-Valve Autobot!
I do not think using 4020 to clean it would be a good idea. It is an Automotive reducer, not a cleaner. I think it would leave a film. Use a wax and grease remover. I have never heard of this before, so I might be wrong...Now i saded the helmet dry 600 grid and cleand it whit 4020.
New attempt. Lets see what happens.
Cheers and hope it works this time for you