Cleaning is essential for running and maintaining the solar system:
Especially, in the dry season the solar system operator or manager has to clean the panels once every week! Because, anything that accumulates dirt on them (e.g. dust or pollen), needs to be removed. However, in the rainy season, but only when the rain is very strong, it washes the dirt off the panels as well. That is why you have to clean your Panels less frequently, but still once every month!