Poaching, i would look at it more as expanding your business i have heard for years from winodw cleanes in one of my areas say that this is my area patch work etc. I tell them no-one owns an area its up to the customer who they wish to clean their windows and what service they require
If they are loosing customers they should be looking at their own standards and asking themselves why they are loosing business
If you are a good window cleaner and you do your job as you should you will have loyal customers you will soon sort out the time wasters, then when people come along canvassing poaching looking for new business whatever we want to call it you will still have your loyal customer base.
If someone cancels your service for a petty reason for another wc they are not worth having there are plenty of customers out there
Undercutting is a sticky subject are we yet again telling the customer what they can pay is it not up to them if they want to pay more or less and if they want to shop around as we all do. I will be the first to admit i charge as much as i can because of the standard of my work so i cant complain about undercutting, so this just leads us back to someone saying this is my patch so it seems to go round in circles.
At the end of the day in your area and my area there are loads of window cleaners as you would have noticed some of them will pass the time of day and some of them look at you as if they want to kill you we are all in the same job, even if you buy a round it doesnt give you sole rights its all about business and earning a crust
regards

Brett