So I was recently in a 55+ neighborhood that every home came with solar panels. I was doing a normal maintenance cleaning of the windows with my WFP when the client asked me to do the solar panels as well. Hopped up on the roof and knocked it out real easy. What I didn’t know though was that across the street and a few houses over was a maintenance/repair team from Tesla. (They bought out Solar City and handle a majority of solar panels installs in my area.) When I was packing up one of the guys came over and was asking what the process was when I cleaned the panels. I described to him the process you show in your video and he asked for my card. Apparently, using a WFP is not a common method in my area, although it is the preferred method reccomended by Tesla.
What has now come of this interaction is I have had 15 new clients ask me to come and clean just the solar panels at $6 a panel.
So my take away is this, find the guys doing the repairs and installs, tell them you use a WFP/pure water to clean the panels, and see if they will recommend you to their service clients to do annual maintenance cleanings.