It has been proven by experts that cleaning solar panels will maximize their efficiency and your savings. Experts agree that dirty solar panels don't produce as much power as clean panels. That loss may range as high as 25% in some areas according to the National Renewable Energy laboratory. The more dirt - the lower amount of electricity they will produce. While many factors affect how much electricity your solar panels will produce - dirty solar panels can be one of the biggest, and easiest to fix.