I guess, there could easily be a nationwide company set up for domestic window cleaning, in the way Dyno rod, has for drain un blocking, but hey there is still loads of independant guys doing the same job,
people do like reconmendation by word of mouth and to know the guy who cleans there windows.
and like I Just said there could easily be a nationwide company creeping up on us, but I dont think any window cleaner doing a good job has anything to worry about.