I love it!
Just one thing: Lose the wfp picture...change it to ladders!
99% of the people you are canvassing have never heard of wfp and will look at the picture and wonder "why is this guy Hoovering windows?"
G.Formby is most peoples idea of a window cleaner...even if you are 100% wfp keep the illusion alive.
A roll-up hanging out yer gob is also a good prop when quotting