The Camco 41960 is a simple brush with an aluminum handle that has a button to regulate the water that flows through the handle. The brush is designed to clean cars, boats, RVs, and other items, but works great for cleaning solar panels. The aluminum handle is sturdy and can telescope to reach closer or further, depending upon the application. The brush is 10 inches wide and has firm and soft bristles for scrubbing dirt that is caked on and brushing it away.
You can find this product on Amazon.