How pure water window cleaning works.
The water we have in our taps is filtered to meet national water quality standards. This water is safe to drink, but still retains a level of mineral content. This mineral content gives water its individual taste and can vary depending where you are in the UK.
When this water is applied to a surface and allowed to dry, it is these minerals that are left behind to cause spotting and watermarks. They are too heavy to be evaporated. However if we first remove these minerals and then apply pure water to a surface, the pure water will evaporate completely leaving no spotting and no water marks.
Pure water is rarely found in nature due to its ability to absorb minerals and contaminates from its surrounding environment. When the water is ultra pure, this absorption rate is significantly increased, easily coping with the dust and dirt commonly found on glazing. Window cleaners use this pure water, applied using a soft brush, to a blemished surface. The pure water then absorbs the dirt and dust contaminates, the surface is rinsed, again using pure water and allowed to dry naturally to a spot free finish.