The shield I am using for my lid is an orginal AGV and it's anti-scratch. But it's not anti-acid. I mean, it has an anti-fog option but sometimes you can't avoid a bit of fogging when your are doing long and hot rides.

Now as we all know, human sweat is acidic by nature so after a while I have noticed that the inner side of the shield (the side exposed to fogging) is no longer as smooth as it was supposed to be. I'm thinking that maybe somehow the acids have got something to do with the deterioration of the plastic surface.

Is there any cleaning agent available out there for this type of thing?

Thank you guys!

Scratch remover like "Formula One" will almost certainly work.

Wow! Cool. Thank you Frank. :)