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pdale
I've written a script out on my blog for canvassing, feel free to have a read and print out if needs be.
http://www.solutionsforwindowcleaners.co.uk/2013/11/canvassing-what-do-you-say.html
http://www.solutionsforwindowcleaners.co.uk/2013/11/canvassing-what-do-you-say.html