You are right, there is a figure, but with competition so hot on this at the moment, with soooo many wanting a piece of the pie, so many claiming they are 'trained' for solar panel cleaning, when there is no training, which is deceptive to prospective clients and with so many guessing their way through a completely different ball game to window cleaning, I for one will not publish on an open forum my 'free-to-all price guide' for solar panel cleaning.
People already copy and paste my website left right and centre, I've issued and won one DMCA recently and may have to do it again. I won't be letting these people copy my price structure too.
It took me YEARS to work the whole spc thing out. I've got it about right now. I will not give everything away anymore than Microsoft telling their rivals about their latest gig. It is down to the competitors to work it out for themselves and then play catch up.
As you say, it's the survival of the fittest so to speak.