I have had customers ask me, while I'm there can I clean the conservatory roof or guttering, and when I tell them that I cant do it right there and then they looked surprised lol.
I tell them I have a tight schedule, and cant just stop everything to clean the conservatory roof, I tell them extras need to be booked in. they dont understand I have other customers!! and how would they like it if I was running late for their scheduled window clean because I was cleaning other customers conservatory roofs lol