A customer asked me to clean their solar panels today. (This pic is provided for help discerning a price if you could help me. BUT that isn't why I started this thread.) I hear you have to use a soft brush on them, I wondered if anybody had any advice, those who clean solar panels regularly or those who sell them for if any were designed with Solar Panels in mind. Thank you in advance, this will be my first Solar Panel job, even though many of my customers have them, and hence I will be opening up my options for the rest of my customers. By the way, there is one pic with a set of panels 10x2. In the second pic is another set of 10x2 and a further set in the far right of 15x2 but those are bigger. I need definite help with pricing.