Professional window cleaners often employ specialized equipment and techniques to clean high up windows. One common method is using telescoping rods with attachments that allow them to reach the windows without the need for ladders or scaffolding. These rods can be extended to access windows at various heights. Another technique involves using water-fed poles with purified water. The purified water is sprayed onto the windows, and a brush attached to the pole is used to scrub away dirt and grime. The windows are then rinsed with the purified water, which dries without leaving streaks.