I voted yes. This is how door hangers work for me. When my guys are done with a driveway in a neighborhood I make them drive around to a minimum of 3 houses in that area that need a cleaning and leave the door hangers. I have 1 sided door hangers and I have my guys write on the blank side say we did Mr So and So's driveway down the road and will give you a 25% discount if you call in this week. Then I have them hang the door hanger on the blank hand written side. People think they are receiving a message from their neighbors or something and actually look at the hanger. I prob get 1 call every month off them.
I have also hired a service to distribute them out in bulk. Didn't work that great, but definitely made my monies worth.