Solar panels are a long-term investment, and their output depends directly on how much light reaches the cells. Dust, pollen, bird droppings, and soot all reduce output, and the loss is easy to miss because it happens gradually. Comparing your inverter's readings before and after a cleaning shows how much your own panels were losing.
In San Jose, dry summers combined with occasional wildfire smoke create the perfect conditions for buildup. A single season without rain can visibly coat panels, and rain alone does not restore full performance.
Our team uses deionized water and soft brushes designed specifically for photovoltaic surfaces — no harsh chemicals and no abrasive tools that could void your panel warranty.
For most South Bay homes, a cleaning at the end of the dry season, before the first rains, restores panels to their best output.