You have made a large and wise investment in your future. Make sure that these Solar Panels keep on providing you with the optimum power conversion by cleaning them periodically. We use a clear water with brush on a pole system to directly put the water where the dirt and grime are. We also use a specially formulated cleaner designed for Solar Panel Cleaning in those hard to remove areas. Clear Water is Di-Ionized and has less then 10ppm of minerals or chemicals. This pure water acts like a magnet and pulls the dirt from the Solar covering and rinses away clear so no spots or residue remains on the panel. We also use this system to clean Window Glass for a spotless clean.