Yeah, like the furniture polish? At the place I am working now (aircraft mechanic working on 2 wwii waco biplanes) they use furniture polish for the plexi windscreens. They got they idea from some of the guys in the warbird community. There is an outfit with 3 mustangs nearby that I have now seen using it. I think the idea is that it keeps water beading and bug/dirt from sticking. No harm to any of these 60 year old aircraft from what I have seen. Anyone else ever heard of this and wouldnt it work just as good on a helmet?