So I was reading around about finding a Rain-X substitute for plastic (ie. Face shield, screens, ect). Found many forums with many possible solutions. So gave one of them a try.... simple household lemon Pledge. I tried it on my passenger helmet 1st to see how it worked and BAM... crystal clear shield that repels water. So far I have used it on my clear and dark scorpion face shields, the screen on the bike, and even my sun glasses. Works wonders and from further reading is totally safe for plastic... in fact it's said to even fill in small scuffs and scratches. All my plastic looks like brand new again. Have been doing this for about a week and it does not seem to cause any light refraction at night or any fogging.