yes I've had it about 8 years ago - got some idiot phone me on his mobile saying i was nicking all his customer etc , 
I kept him talking for 20 min's ( back then that must of cost him a week wages LOL ) I never did see him around .
I told the customers about what had happened , I got most of the estate in the end because of that . 
all the window cleaners I see about all wave going past , somtimes you end up next door and talk aload of crap ( co's it the first person you've seen all day .. ) 
I tend to bump into loads of window cleaners  round the  breaky huts drinking tea and eating the bacon butty -  all like to have a chat .