Flyers are ok, but to be quite honest, its far better to canvass work.
Yes I know its not particularly pleasant to go knocking on doors, but believe me, it works much better than flyers.
Average response for 100 flyers is about 3%
Average response from canvassing is about 35%
Only a certain type of customer will respond to flyers, and they are often the ones who will moan about price.
You can see which houses are dirty if you look closely enough,
just be friendly and say "I noticed your windows hadn't been cleaned in a while, just thought i'd call and see if you'd like them doing"
Its that easy, so stop messing on with expensive-waste-of-time flyers and get knocking!
Silly