A solar system spends every day outside, working through heat, rain, wind, dust, pollen, salt air and bird mess. That exposure is exactly what it is built for, but it also means the panels slowly collect a layer of grime that can block sunlight and drag down performance. Clean panels are not about appearances. They are about output, safety and long-term value. When solar panels are clean and well maintained, more light reaches the cells. The system can produce closer to its e