Hi Clear Vision,
I am not sure why you are having this problem?
The points I can offer you are this
1) 1st cleans you need to do in 2 hits, frames and glass, then back after the whole house is done and then just clean the glass only.
2) NEVER get water into the air vents above as they are a nightmare and will always cause you problems.
3) Rinse, Rinse and Rinse again, if you have managed to get water up into the frame unless you give it a thorough rinse it will always drag out the dirt from underneath, you will really need to give it a good rinse and then when dry do the glass again without the top frame.
4) Remember, WFP is not the definitive awnswer to window cleaning, it is purely a safer and alternative method, you will come across some glass that just won't accept this method so you will have to clean it traditionally. Thankfully these are only few and far between, but it happens
I know you have had a hard day and no doubt are questioning yourself and WFP, all I can say is stick at it and it will come good.
Keep smiling
Best wishes,
Trev