There's only two window cleaners in my area who I'd knowingly poach work from, (it's not Squeaky either); but I'd never do it on the basis of being cheaper.
But if you're asked to quote for a property, my first question is NEVER, 'Do you have a window cleaner already and if so who is he?'
I'll do the best I can to get the job; if it's one I'd like.
Ian_Giles recently phoned me with regards to an account I did around once per year for £100; on demand.
He was asked to quote for it. I hadn't heard from them in well-over a year.
I told him to go for it and he did. He got the account for £110 every eight weeks and good on him.
Very probably the receptionist who used to phone me has changed jobs; the new one didn't know my phone number and Ian was in the right place at the right time and was asked.
It's tough on me, but there's lots of work out there; so I'm not bothered one iota.
You've got to have a 'couldn't-care-less' attitude when it comes to losing accounts otherwise you'll just spoil what should be a fairly stress-free occupation.