I'm one of the guys that leaflets, then goes around a couple of days later to ask if they got our leaflet, and ask if they are interested. If they say yes, I then tell them how often we come and how much it costs. I also ask if they have fly nets on some windows or if they have a gazebo in the way of some upper windows, as this would effect the price, in other words, if I can't get to some windows, I would reduce the price etc, or clean them from inside (that's possible here as the windows all open inwards). If they say yes, ok, then I wouldn't say, by the way, if I find dog poo all over the patio, or nappies lying in the garden, or cig butts all over the place, then you will be dumped.
If I find your back gate locked and you expect me to climb over to get to the back windows, I will charge you full price untill you learn to take window cleaning as the most important thing in your life even though I only clean the fronts. If any of this applies to anyone, then good luck boys. You are on the way to becoming the new Alan Sugar.
If one custy is happy with a WC, he will tell ten others. If one custy is NOT happy with his WC, he will tell thirty. Spouting off on here like some do is OK, what we do in the real world is what makes the difference.