Solar Panel Cleaning Power Brush (double brushes)This double head solar panel cleaning brush will save you time and energy as it cleans panels with very little effort. This automatic rotating brush has the power to clean any panel with speed and efficiency. With electric and portable batteries to run auto brushes Dual Brush design scrubs away surface dust, mold and bird droppings with ease Counter rotating brushes stabilize the system 38 inch cleaning path Can clean an estimated 5000 to 8000 square