Dirty windows are obvious when they need a cleaning. With solar panels, that may not be the case. Because the location of solar panels are often on top of roofs or on elevated platforms it can be less obvious when they’re in need of a cleaning. However, unclean solar panels are less efficient than clean ones. Sometime by as much as 30% or more. This means dirty solar panels cost you more money than clean ones. For maximum energy efficiency, get your solar panels cleaned and rest easy knowing your professionally cleaned solar panels are giving you the most for your money.