Have you been using magica onego, g101, tfr, virosol or ubik2000?
The only time I've seen anything like that was when I was working with someone else cleaning up a first floor flat's windows and frames. He had scrubed the frames with a hard surface cleaner that contained sodium hydroxide (caustic soda which are in g101, magica one go, strong arm, etc).
After he'd rinsed down the upstairs window with wfp, the upstairs frames looked great when dry but the window frames downstairs and underneath looked exactly the same as in the picture although they were white and not oak colour.
It had also dried on the glass downstairs and it took loads of water and lots of arm work with those green sponge things to get it off the glass.
What we did about the streaks was to thoroughly clean up the downstairs window frames with the same stuff.