Most, if not all my residential customers are now happy with the windows left wet, in fact it's a little treat when they dry, they look out and say ooh look isn't it good, it works, no spotts or smears, gleaming!
Most if not all my commercial customers couldn't really care less as long as they're kept clean.
I think on those two points it's only the window cleaner who needs pleasing with dry windows.
But there is obviously a huge commercial market where this will be usefull if not vital, like indoor shopping arenas with huge glass galleries and curtains etc. Areas where there are always people about, like airports, train stations, bus stations etc.
I can't see it being for us small fry
