GB, sorry to hear your still having problems.
What perentage of your customers are complaining 1, 5 , 10%?
I had some custies who were dead against wfp and always had me nervous and deflated
they cancelled or i did.
Had one last month small front do upstairs wfp big downstairs window do trad.
started doing downstairs window wfp and all of a sudden all windows are streaky!
I notice your di in a hard water area, i think this must be making things harder, do you check ppm regular.
what brush are you using GB?
Is it a mono-filament (doesn't trap dirt in bristles, which can cause spotting)
Can you gt a few hours out with someone on here?
where do you live?
When i first started wfp, i put a couple of tiny drops of gg3 in each barrel
i mean two tiny drops i'm sure this made life easier.
I remember justin ruggles on clean it up use to soak his brush in a bucket of pure water with tiny bit of gg3, and he was suprised at dirt particles in bucket at end of the day.
This was a few years ago and we have more brushes available and vikan make mono-filament brushes now to.
I hope somewhere in all these posts is your answer mate; keep going