Cleaning solar Modules is not a easy job because it is not like cleaning any glass sheet or windshield of car , it requires several safety norms for the aluminum metal , glass & glass film to be taken care off so prefer to use organic /green chemicals and also avoid using hard water & hard chemicals during cleaning.
The life of solar modules is 25 years but due to the use of hard water and hard chemicals the life May be restricted to 10-12 years only. The use of hard chemicals May erode aluminum from the aluminum frames of the solar module and stick on the glass making it blurred and making a permanent damage so use only soft chemicals and soft water for cleaning solar modules .