wooden windows!!
I assume you're wfp??
I was gonna say all my few complaints have been with wooden windows, but i had 1 earlier about upvc but that was leaving some cobwebs behind.
The good news is that they will almost definitely come good in the end.
The bad news is that it might take many cleans and you might have to run a cloth over them until they do.
I always go back and check 1st cleans and especially if they are wooden windows i half expect to find spots. Once they come up good the 1st time they will come up good in future and you can walk away once finished.
I have a £40 job that took 8 months/cleans before i could wfp them and walk away while still wet. The only good thing about it was the £40 obviously but by the time i'd finished the windows were almost dry anyway and needed the minimal of wiping with a microfibre.