yes tried and tested various pitch's with differing results depending on which season you plan to knock.
you will find that as long as your opener isnt cold ( drop leaflet twice ( 2 days apart ) then pitch) you should be fine, they take to it much better than utilities windows etc etc.
but
dont go for a
fast close let them close them selfs with the idea of possibly using 1 of your services in the future, depending on the structure and content to your pro active campaign you should be fine.
if you want to have a private chat about this subject give me a bell 07932 706390 Ricky
There will be always that are anti canvas/sales and that's fine

The world would be boring if everybody agreed with you and seen it from you point of view !!
Mind you, if the cana is a seasoned pro they always agree/ come around to your way of thinking