KEMPY ok maybe blaming vision was a bit harsh mate. 
my work ethic is a bit different than yours in so far as i very rarely have a day off if i have work to do whatever the weathers doing as i like to keep on schedule as much as possible that includes working in rain/wind/sleet/hail/light snow etc.
its not that i need to work cos im short of money its just how i run my business to maximise earnings and not get behind schedule.
i cant remember when i last had a complaint/call back before this week.
Daz I'm the same as you. I clean in all weathers, unless it's blowing a gale and torrential rain at the same time then I crack on.
The way I look at it is that you could clean someone's windows on a beautifull clear Monday morning, then on Tuesday it could unexpectedly be wet and windy. The weather is unpredictable and windows get dirty. Imagine how dirty the windows would be if we hadn't cleaned them before the storms? You just have to crack on.
Regarding your worries about vision I understand that you'd be concerned, but I can honestly say it's not the case. Of anything it's the opposite. I've still got a small round that myself and my dad work together. I do all the upstairs windows WFP and he follows doing all lower windows by trad. It's not ideal, but works well on this particular run.
Anyway I went back a week later to do a gutter clean on one property and the whole front of the house (most exposed side) was filthy. We had snow, sleet and high winds for a few days on end.
The interesting thing though is that the downstairs windows that were cleaned trad (using pure water and ecover)were far dirtier than the upstairs that were cleaned using pure and vision. Read into that what you will, but external poor weather is the blame of dirty windows and not the quality of your water.
If anyone is unsure it's easy to do a test.....clean one of your windows at home with just pure, and one window next to it with pure/vision. I've done this myself and found the windows cleaned with pure/vision stayed cleaner for longer than just pure.
