Did you know that you can lose up to 20% of your energy efficiency just from having dirty solar panels? Even just a thin layer of residue on your solar panels can impede their ability to function, and could be driving up the costs on your energy bill.However, there is more to cleaning solar panels than taking a hose or pressure washer to them. A high-pressure attachment risks damaging your panels, which would result in an expensive replacement fee for you. You would also have to avoid using detergents, which can leave streaks, and abrasive powders or scrubbers, which can scratch your panels and diminish their efficacy. Calling a roof cleaner to clean your solar panels is your best bet.