The windows are not really any harder to clean at 8 weeks or 12 weeks. Increased risk of a bit of bird crap or whatever of course. The real difference is in the sills and, this time of year, the cobwebs. Even so its no big deal.
My point is that you give the customer the service they want and thats what building a solid round is all about. Fewer and fewer customers want four weeks and thats a fact. I charge a good price, based on an hourly rate and just bash on through my list each day. It makes absolutely no difference to me when they were last cleaned.
Its actually better for me because every day is different I don't get that stuck in a rut feeling. Besides, I don't think many of my customers would pay my prices every month.
To me the thinking changed when I went WFP, its more than just a different method of cleaning. It enables you to develop a different attitude to the way you work. I started using George at the same time and the combination of the two has really made a difference to absolutely everything.