dont worry am expecting loads of answer like i return them to new,
but how cleaned do get your windows, as i got some that come up great, and others that the frames just cant remove some of the dirty, custy dont moan, but some times bug me, that i got the odd mark that wont come off, manily green bits in the gaps in the window frames (pvc)
use to do some windows that would not come clean at all they sort of had this grey area across the bottom of the frames and glass and no matter what i did would not come clean,