I have 5 custys in the waiting and maybe 30 more.there not happy with the local trad guys smearing windows and not being reliable.think they could get.upset 
just hope someone starts taking your work and see how u feel about it
That's a pretty predictable answer, but it's an empty threat if you give it a few second's worth of thought.
Unfortunately, you see, anyone takes a customer off me and I'll rejoice. It'll be a cheap way to find out the things I'm doing wrong. At the moment, I put a lot of time and mental effort into finding out what I could do better. Someone leaving me would give me instant feedback so I'd immediately know what to address.
So, to make it concrete as per this thread. If I was smearing windows, someone leaving would let me know that and if I didn't change my ways I'd deserve to go the way of the dodo. If I was doing nothing wrong, no-one could steal my customers.
Vin