I've been canvassing for a few weeks, and find the "I'm looking to expand my window cleaning business ......" line seems a bit long winded for me, especially when it's the first few doors and I'm a bit nervous.
I've now settled on " Hi, Sorry to disturb you, do you have a window cleaner at the moment ? " short and easy to get out, and gives them the option to say yes we do if they just want to get rid. The ones that are interested but seem a bit wary I just ask if they'd like to know the price if they did have them cleaned regularly, then give a card and let them think about it knowing I'm a genuine set up. The ones that really do need someone are easy peasy, " ohh yes we do need a window cleaner" give the price and tell them the cleaning day/collection method/card through door if not in etc etc.
I had a bad night last night, tried a few streets and every one had a cleaner who did, and kept, everyone that wanted cleaning, but it's great when you get that street that's in need, which are out there....