Cleaning the snow is useless as usually the sun is very weak in winter and when it’s sunny the snow will melt by itself. In summer you should use distilled water and a microfiber cloth for cleaning solar panels and vaccuum tubes from dust and soiling. It’s recommended to do that when the sun is gone. Usually you don’t need to clean solar systems more than once a year. If you have any questions feel free to call +374 91 19 28 18.