as far has i am concerned there's no panels left to clean some f****r in Telford cleans them all
I think what you have done is great and cornered a market were the customer is really focused on the monetary value and return, ie large commercial work, the website is dedicated to solar cleaning etc
I still personally think for the domestic market the mind set is different and due to the large amount of cleaners available to clean the panels the price is low and static and for some of the prices i have heard paid and qouted its not an avenue i will go down
I have today just taken solar panelling of my website and jigged it about a bit, so even if i did get a massive array today with all my domestics i wouldn't have the time
so for me its a no, but good luck steve