Why should anyone use water for window cleaning? Hard water leaves stains and streaks on your windows. Our organic polymers extract such dirt from the glass. Remember, glass is porous. Overtime dirt goes inside the glass to create permanent damage if not extracted beforehand. Therefore, we highly recommend window cleaning at least 2 - 3 times a year. Although it is some what time consuming our way, which is the best way, to clean windows is to spray thoroughly and clean using micro fiber towels. We use our own in house organic cleaners and only the best quality micro fiber towels.