comercial hit and miss, they can change whenever for lower quoted clean, private people canvass place on ebay and sell double the amount of clean. this way you will sell quickly. sell at to higher a price no mug will buy. if you went out in my area which is too far 4 you and got £300 worth of customers i would pay you £600, but i would go to every address to comfirm them as a potential new client. its too easy to say you have £300 of work and actually only have £100 of work, do not trust anyone selling work unless you know its from a genuine window cleaner selling a round locally.
there is money to be made canvassing if you do it right you will always sell your canvassed work on here or ebay, once you are established you wll be able to travell and claim overnight b+b on top of your sale.