The Fogdoc line of anti-fog products have quickly become one of paintball's top choices for lens prep to combat extremes in temperature and the fogging issues that result.  FogDoc now offers their unique formula in a 16oz stay bottle with a convenient soft Microfiber cloth.  This solution can be used on many surfaces including glass, plastic, mirrors and all sorts of goggles.  Heck of a deal for under $20!