What?! Squeegee?! Squeegee after WFP?!
Are you bananas?!
Absolutely defeats the object of pure water window cleaning, adds time + effort, isn't practical, I mean, can you seriously tell me, you can squeegee off every bit of water off those extremely awkward windows?!
It is your job to educate your customers about the process you use, part of consolidating your agreement with your customers should include the method you use, therefore they know what they have agreed to. If they dont like water on the windows, do them trad, or get another customer. Why add time and effort to a process that is based around speed, flexibilty, and most of all PURE WATER.