All this strikes me as nonsense. I canvass wherever I want. I leaflet, then follow up with a door knock.
You can't "target" another window cleaners work unless his customers are unhappy with him.
You knock, the householder says "No thank you, I've got one already" So what are you going to do then? Tell them they've got to move over to you or you'll bash 'em with an iron bar?
You can't poach another man's work unless you ask the customer how much they're paying, then offer to do it for less. Anyone who does this is stupid, because they'll make enemies who could be very nasty, and the customers they gain won't be worth having because they'll drop you for the next one who comes along.
Anyone who does a good job has nothing to fear from competition, so we should all be running our businesses on that basis, and living and working side by side with no "my patch - your patch" attitudes.