I went to pick a van up with my daughter yesterday and got chatting to the guy selling the van, he told me a guy turned up with a set of ladders and asked if he wanted his windows cleaned?
He said he hadn't got a window cleaner so how much to do a 7 bedroom house, WC replys £15 the guy jumped at it, This guy turned up once again and he hasn't seen him since :

To far for me to travel but I priced it at £35 for the amount of windows he had.
I said its one of 2 reasons you haven't seen him again.
1. Priced it wrong
2. Summer brigade