leaflets are only good if someone else has done a drop a few weeks before you do a canvass, Lee Pryor kindly did a drop in Bromley where I picked up 12 £20 easy access houses over 2 roads where his leaflet warmed them up for me for the taking.
canvassing always is king to gaining customers fast unless you spend thousands on leaflets which still wouldn't come close with hour to hour or back to back response rate as knocking will always win.
To get the best quality targeted customers you need to hit the sold boards, soon as the sold board is down go hit the house and explain how you already clean in the road and assume they want there's done as just moved into there nice new house, works nearly all the time unless they do it themselves or already have a cleaner in place.
A mixture of all would build a half decent foundation round in a few months, then spend years compacting and refining until its just as you want, would only use a leaflet to drop into the houses no one is in though.
Good luck