Good thread, this is one of the reasons this is one of my favourite forums.
I have read through the post pretty fast, not as fast as I clean window though
I have wanted to reply to most of the posts but will start with one of the earlier ones with regards to my short videos. These videos show exactly how long it takes to clean glass with a WFP, and the windows were left at the end of the clean spotless. The windows were last cleaned approx 4 weeks previous to that cleaning. Had there been any fly or bird mess on the glass it would have been dealt with appropriately, but like Ian has already stated there is never much on the glass from month to month.
Had the glass some birds dirt or fly mess on it then although it may have taken longer you would be lucky if it would have taken 10 seconds longer per window.
The reason I cleaned the window under the second window I cleaned was to cut out some walking. I would have had to walk over to the window below the slopping roof, then I would have had to walk back to the one below the second window I cleaned, that would have doubled the distance I had to travel. Even if I had done it in reverse starting at the second window then the one above the roof then the one below the roof, then the last one I would still be doubling the distance I had to walk. Not much time granted, but add another couple of task that you could save time on and then multiply that by the amount of houses you clean and you have a significant daily time saving.
Had I rinsed separately, or had there been something on the glass that would have made me use more water than usual, then I may have cleaned the window under the roof first to allow the other widow to stop dripping on the window below. But in this case a very minimum amount of water was used causing no problems on the windows below.
As far as the results are concerned the videos were not for this reason. I think every window cleaner in the UK knows that these systems work, what most ask now is what sort of time saving can they expect.
Peter Fogwill