Seeing this thread brought back memories.
I worked for an auto glass manufacturer for many years. We used Windex all the time with no thought; I mean it was made for glass cleaning, so how could it ever cause any issues? I mean we used several gallons a day throughout the entire plant thinking the cleaner we got the glass, the better it had to be.
We had an adhesion issue with one of the components we bonded to the glass, and after a lot of lab analysis, it looked like the Windex wasn't necessarily the cause of the failure, but did leave a residue that did have some negative impact on adhesion. As a result, Windex was immediately banned from the plant, and a lot of the employees went home with a bottle of it that day.