The E-Cloth Window Pack quickly and easily cleans all types of windows, including frames and sills, leaving a perfect streak-free, lint-free, finish. Removes 99% of bacteria, all using just water. Wet the waffle-weave Window Cloth with warm water and wring out to remove excess water. Once clean, follow with the dry Glass & Polishing Cloth while the surface is still damp for a crystal clear finish. We recommended folding both cloths like a pad to ensure good contact with the surface and a more thorough clean. In between uses, rinse with warm water and hang dry, and machine wash weekly.