I clean wfp and traditional. Today I was going to do wfp all day as it was a bit too gusty for the ladders where I am. Did a large house first, big conservatory. While cleaning it I was thinking that this is great as I probably wouldn't have bothered going out in the wind when I was just trad. When finished I put my gear away and put the slip through and then went along all the sills with a cloth (fussy customer) and saw that all the windows looked like they hadn't been rinsed, within just a few mins lots of dust or bits of something had stuck to the wet windows. I had to go around them all with the squeegee otherwise I would think they would have spotted badly.
I can't think I've done a check like this for ages so, although I haven't previously had any complaints, it makes me wonder...is wfp not for windy days same as ladders aren't?