It is also recommended to clean them once it goes dark outside due to how solar panels work at night.
Moreover, when you decide to clean your solar panels, keep in mind to do it preferably during early hours (6:00 am – 7:00 am) or during late afternoon (5:00 pm-6:00 pm).
How often should I clean solar panels?
Dirty panels can reduce their output by up to 30%. So, a good rule of thumb is to arrange for a cleaning at least every six months, possibly more if you feel the panels are constantly getting dirty. If there isn’t much of an issue, then one cleaning every six months should be more than enough.