good point stu, but if you are good enough to be recommended then you should be able to keep them, even if they only keep u to get free cleans, but get u a new custy every month then great
to keep a custy just keep the windows clean and turn up and be polite and take a interest in them
i use to have a wc before i became a wc and never even knew his name, most he ever said to me was, that will be x amount or this is the new bloke taking over, and had him over a year i think the window cleaner change about 3 times in that year