Asked a customer to open the small windows, and wipe round the parts we cannot see.... under the frame opening...
thats where the dirt is... that is what runs down as dirty water, once we have left...
told her to leave one window as normal, and to ring me back if streaks appear later.
she was a friendly person who was intrigued by the wfp system...
so easy to test.
she rang me back , as expected, streaks down the un wiped window.
she wiped it, i washed it .
perfect.!
i know we cant all ask our customers to do this, but for a long while now, i have thought thats where the problem was.
so i thought i would tell you.
