Spray our ammonia-free glass cleaner onto glass, mirrors and wipe clean with a lint-free cloth. Before you dampen window panes, whisk frames with a soft-bristled brush to rid them of cobwebs and loose dirt. If you own a nice squeegee, be sure to dampen it with Glass Cleaner beforehand - a dry blade will skip. Washing windows on a cloudy day is best. The sun can cause wet windows to dry too quick, which can result in nasty streaking or water spots.