I haven't tried Rain-X, because whatever some people have said, to me the screen looks slightly misted, which I don't like. I'm with the 'clean screen and decent blades' brigade.
Regarding misting of the inside, a smear of soap on a damp cloth works wonders, and doesn't cost much. This also works on welding goggles etc.
Regarding misting of the inside, a smear of soap on a damp cloth works wonders, and doesn't cost much. This also works on welding goggles etc.