I have never been comfortable with wfp, the manager of a residential home wants to speak with me next week said the residents have issues with water left on the windows to be honest I see them leaning out of the windows drying them sometimes it doesn't matter how well you put the concept across to some they'll never get it if I was 10 years younger I'd probably go back to ladders, it's crazy really because when you've done both you know pure water is a better way the results must be yet people never seem to moan about soap residue or sun smears, it's made me paranoid when wfp cleaning if I see one tiny dirt spot I keep checking and rinsing and it's making the jobs take longer when in actual fact you probably wouldn't see anything wrong when they are dry unless you put your face up against the glass with a magnifying glass, I did a commercial job with a mate which is done every 6 months, I was doing inside upper glass while he was poling outside there were small dirt spots on nearly every pane which we wouldn't see from outside I never mentioned anything to him because we would have gone over them all again making the whole job take about 8 hours for 2 people for a £350 job if they are done twice a year then what can be expected, if you used ladders and soap it would be a nightmare they would need scraping you can't win.