goes a bit like this" hello I'm just in the area promoting a professional window cleaning service would you like to us to add you to the round, we're city and guilds qualified, crb checked and fully insured, we do all the frames as well as the glass and follow all the relevant health and safety guidelines" I do tweak it depending on who I'm talking to and try and have a laugh with them also, important thing is first impression and try to get them to like you quite quickly, always wear a uniform, don't stand to close to the door,I always knock and then step back, if they have a window cleaner I never undercut I simply hand them my card and ask them to keep it safe in case they get let down by their cleaner, I always ask them to look at my website in case there is a service there that their present cleaner doesn't offer, 1- it will get your ratings up, 2- you never know if they add u to their favourites for future reference, 3- you may offer a service their cleaner doesn't, I have had a bit of Guttervac work and the odd conservatory roof from this approach, another thing I do is I regularly re card streets I have carded before, it really works, hope this helps, give me a ring if u want to chat, numbers on the website ..!
graham