hi jonny i've bought two rounds over the last 18 months all trad work,my advice would be to carry on the trad work,see how long it takes to do a house compared to wfp(packing/unpacking hoses round wheely bins plants etc)if as stuart suggests they are 3.50 a house give it a wide berth or ask for a much reduced buying rate ie 2 times the value you can't wfp these and make a living unless very compact as in terraced homes and all the street is yours,if you do buy it,i would trad it and then suggest to the house owner you clean another way aswell/explain the benifits but there can be a "wearing in period"ie spotting etc(you can soon see the custies who are prepared to go the long haul to get clean windows-its how you educate them)overall jonny if the round looks like a pain to do either trad or wfp leave it mate they'll be others in the future