Its not just window cleaners, I had a painter and decorator doing work in my house a while back who done a first class job
for around £30 an hour, if I was now after a window cleaner I would be shocked if he was looking £20 for a 15min clean and it
would certainly drive me to shop around.
I think property management is the future, looking after the whole property, gardens, windows, gutters, fascia's drives and so on
where you can put it a decent yearly price for the lot which doesn't focus on one thing.