Ditto to all of above.
I have a number of good mates who are window cleaners and I know which areas they cover. So the other day for example through social media I had an enquirey which was in a friends patch so passed on his details instead. Not worth going out my way for windows to just one house, unless I can canvass others at same time. But happy this time to pass onto friend. But if a one off big clean like cons roof clean, then thats a different story.
It comes back round. A friend is trad, he has a regularly cust who wants a fascia clean. He cant get to bk ones or upstairs bk windows due to an extension and the skyline windows on it. So hes fetching me on job to price it up for fascia clean n bk up windows as a one off.