A water-fed pole is a well-constructed extendable pole with a specially designed brush head on the end and a tube inside. A pump forces purified water up the tube and a button on the handle of the tube sprays water. The specially designed brush head loosens dirt, debris, mineral deposits and leaves from the windows. Then the water is used to wash those things away. The windows dry naturally in the air and the sun. Since the water used is purified by reverse osmosis there are no chemicals, minerals, or other things in the water that would leave streaks on the window. It’s not necessary to dry the windows to keep them sparkling when only purified water is used. The water fed pole doesn’t even need detergent to get the windows clean. The brush and the purified water do all the work. This is the method used by most professional window cleaners today.