Window cleaning with pure water is accomplished by taking ordinary tap water and filtering it down until there are no minerals present in the water. This process turns tap water into a mild solvent which is eager to dissolve dirt and other contaminates on the surface. As the pure water strives to return to its impure state, it gathers and holds the dirt. The glass is given a final rinse with our Water Fed Poles and any water left on the glass will be clean and pure, free of dirt. The result is a clear, streak-free finish that dries naturally. We have the ability to wash windows with Pure Hot Water up to a height of 35 feet from the ground. The following photos show my 80 gallon hot water unit and a 60 gallon truck mounted unit. We utilize Water Fed Poles that reach up to 35 feet and all are made of Carbon Fiber.