I do not see the issue.
I list on my website the advantages of wfp over trad. So in a way i am knocking trad.
The ONLY trad i like doing now is commercial, anything else and you can actually shove it!
Taken from a trad website.....
Traditional is a proven window cleaning technique that offers the best possible results. Unlike those using a WFP system our cleaners are able to make a close inspection of all windows once finished. This reduces the risk of any marks being left by accident. To find out more on the benefits of this method over the waterfed brush system, for window cleaning,