In nearly all cases cleaning solar panels will improve the efficiency and production of the solar panel, but by not much.Â
There have been studies over the years to suggest solar panel cleaning will improve the output of the solar panel by no more than 5%. Unless they are absolutely filthy of course.Â
However there is other research that suggests cleaning solar panels massively improves the output of your solar system. The results will come down to the site itself and how the panels are installed.Â
So, cleaning solar panels may improve the output of the solar panel but the moment it’s clean, it’s already back facing the elements – meaning they will get dirty again soon anyways.