Glass Cleaner is great on windows & glass surfaces. It ammonia-free formula provides a streak-free shine. It is safe for use on: glass, windows, mirrors, clear plastic, computer screens, fiberglass & plexiglas. To use: spray soiled glass surface and wipe with dry paper towel, or lint-free cloth. Do not use on varnished surfaces. Glass cleaner for windows & glass surfaces Streak free shine Ammonia-free formula Safe for use on: glass, windows, mirrors, clear plastic, computer screens, fiberglass & plexiglas. To use: spray soiled glass surface and wipe with dry paper towel, or lint-free cloth. Do not use on varnished surfaces.