Firstly lets look at how not to clean your panels…
It is not recommended by solar panel manufacturers to use chemicals to clean your panels. Tap water and rain water will not clean solar panels sufficiently to keep them running at maximum efficiency.
Using detergents to clean solar panels leaves a sticky microscopic film on the solar panel which actually attracts dirt and grime. Again, this will lead to your solar panels not running efficiently.
Doesn’t the rain clean the solar panels?
Just like your car and anything else that lives outside without some kind of agitation the power of the rain is just not enough to remove contaminants and grime.
We use specific products that clean your panels and leave them spotless and clear with no streaking. If possible we clean from ground level with a telescopic pole but if we are not able to reach them we will need to access the roof surface.