Help with Bell Star Shield
So just recently bought a bell star and today I ended up getting caught in the rain with it and managed to get some water on the inside of the visor.(from flipping it up at stop lights) I get home and dry the helm off and take the visor off to dry and notice there's a smudge from the anti fog coating because it got wet. Even when dry the smudge is still there.
My question is, is there anyway to remove the anti fog coating on the inside of the visor? I don't just wanna wipe the smudge with water because it just gets worse and just won't come off with water,can I use rubbing alcohol? or would that damage the shield?