Err looks like the crap running down top of frame is spotty
How much water used depends on how big the mansion you live in bumper?

Don't worry about it. 1st cleans with wfp will leech all the crap out from the window frames and any joins.
I reckon if you go round them again using the same method they will come up fine.
Most disagreed when i mentioned it on here before, but on 1st cleans i always went back to inspect at the end of the day.
Yes it was time consuming the 1st time round.
But once i'd seen which jobs came up fine 1st time, afterwards i made the time up by flying around these jobs and spending a bit more time on problem jobs or windows.
The good thing about wfp is that once you get the windows clean that 1st time, they will be good to go afterwards. It's getting that 1st clean good that takes the time. The more thorough you are initially the easier they become in future.