Many times with rainwater is enough to clean the solar panels. However, at least once a year, a physical inspection of the panels should be carried out looking for dirt, debris or bird droppings or to see if the electricity production falls. If so, the panels must be cleaned.
You can do the cleaning by hiring a professional or by doing it yourself.
When you remove dirt during the cleaning of solar panels, be careful not to scratch or break the glass, either using tools or stepping on them. It is also important not to use abrasive soaps or abrasive liquids because they could damage the surface of the panel. However, before starting, we recommend you to consult the solar panel instructions and / or consulting your supplier.