I clean about 3inch off my panels , Saturday I think . I did not use any water just brushed it off . Started at top and pulled down wards . It sort of builds up as you pull down , and starts to push the snow bellow it off . Mine are only low level so I could see that they where clean . The snow seemed to remove any dirt there may have been on them .
It was good to see that the snow blocked any soar production , but once cleaned the invert came on and started to produce electric again .