A water fed pole used for window cleaning is made up of an expandable pole, a specialized cleaning brush head and a purification system. There is a hose that runs inside the pole which supplies the purified water to the window through the pencil jets that are in the brush head.   Our window cleaning technicians use the combination of the brush and purified water to clean the windows. The Cleaning Process The first step with water fed pole window cleaning is to wet the glass and loosen all the dirt and debris from the window by using a combination of the brush and water. Once the dirt and debris has been removed the final step is to rinse the pane of glass off with the purified water. The purified water is free of minerals and deposits so the window will dry spot free and sparkling clean.