Got this "I'm talking about the rain-x for outside the glass, not the anti fog stuff. I've never tried the anti fog stuff, but I have a neighbor that got overzealous and applied regular rain-x to the inside of his glass and had problems with haze forming on the inside glass." from
here. I also noted complaints about the smell on other forums. Personally I never thought about using it inside. They do make an anti fog rain-x for the inside.
