Canvass for sure bud...but with all the people who are out pop a leaflet thru the door or if you really want to develop the area youre canvassing properly record the numbers of people who are out and recanvass at a later date.We have had an excellent respose doing both and although it takes a boit mnore time it does work.
Personallly i wouldnt bother with leaflets by themselves....will take much longer
Introduce a reccomendation scheme for your customers too...if they give you 3 referrals they get a FREE clean.
Your bound to close 1 in 3.
Good luck bud.Just keep at it, little and often,thats the most impoortant thing.