So I built this Cub throughout the past couple years, and have finally been flying it, which it does very well, but the fuel and the windshield don't seem to agree. Its really foggy no matter what I do, and its driving me nuts. And sometimes when I dry it off, this white residue forms on the surface. I noticed i can scrape this off with my fingernail. The aircraft is a Great Planes 40 Size Cub with a Fox Eagle 60 on the nose.