Yes, Spring will bring 'em out - train them to do it your way, not the other way around!
On a dry day when you've just cleaned a house canvass half a dozen around it, smile broadly and say:-
"Hello there, I'm XXXXXXX. I've just cleaned your neighbours windows, if you'd like me to do yours or give you a quote here's my card." Hand it to them, back away one step and say " I won't keep you now, but my phone numbers on there." Casually turn around and walk away - some of them will call you back there and then, some will phone you later. Guaranteed 100%!
Malc G