Might be why you haven't got enough work Nathan?
I understand where your coming from, but thankfully ive plenty of work. My flyers are for expanding in areas where ive recently taken over a round. You know the drill, a healthy turn over of work.....replace the worse with better work.
But the community hall isnt a charity, they hire them out for functions etc and so run it as a business. Cleaning those solar panels will help them remain efficient so to me thats worth the small £40 charge inorder to do so.
Or another way, 3 windows shown on that picture will roughly make size of one panel. Show how much do you charge per window (if you charge that way) then add a little more for the extra time and for helping them remain efficient.
So is a fiver per panel really asking too much.