Professional window cleaners use a water-fed pole system. The pole is attached to a tank that holds pressurized water. The cleaner inserts the pole into the tank, turns on the water, and then uses the pole to clean the windows. The water-fed pole system is much safer and more effective than using a ladder to clean windows. It also eliminates the need for harsh chemicals, which can be harmful to both people and the environment.

Professional window cleaners use a variety of methods and supplies to clean windows, depending on the type of window and the level of soiling. Some common methods and supplies used by professional window cleaners include squeegees, scrapers, detergents, soaps, ammonia, and glass cleaners.