I think more and more people are realising how much money can be made out of canvassing, if I liked canvassing I'd do it, prolly earn more than actually cleaning them
The thing is none of these companies ever last so it cant be that good...
Soon as you get bad feedback no one will use again.. Just the way it is.
For best results its best you doing it yourself, so ou can target the right houses and areas you want as a canvasser will simply sign up whatever is easiest to get(trampy houses with fridges/washing machines in garden etc etc).
Have you not got any friends or family needing some extra money you could get canvassing for you?? If i need a few canvassers i either do an add on gumtree or a local shop window or i have as my facebook status canvassers required inbox me for details.
Anyway best of luck with it.