Carwashers using WINDEX on paint in Melbourne

[AAXR8]

I was in Melbourne the other day & my XR had fluid tipped over the Rear Quarter panel & I cannot tell you what it was or were it came from because I check the car nearly every second day for anything new because its black. And I went to this carwash that had ALOT of Brand new BMW's, Audis, Mercedes you name it and it was there so I thought this place must be a good Carwash. I got it Cut & Polished 3 weeks ago by a detailing company not a Carwash because I would rather that done by a professional! So anyway I said just wash it with soap and dry it! Pretty simple Instructions and when it came out of the wash these two guys went over to dry it & they had spray bottles with Blue Liquid in them & I went over & by the time I got there they just about finished! And the car looked good but I got one of the cleaners & said, I just wanted it dried why are you spraying that Blue stuff on & what is it!! And he said its like a wax Good stuff for the water it makes it bead! So he wouldn't tell me so I grabbed another guy & said whats in your bottles that you spray on the cars & he said WINDEX!! I have never heard of that being put on the paint before & the car has been washed twice to get any windex off but Can that Product do damage to paint?? Because I was looking around at all these Brand new cars that they were doing it to and that is why I am on here today to ASK if it is bad because I had words with the foreman & he said its fine we do it all the time! Its watered down & then he had the nerve to say we do it to Cars that are worth a lot more then yours! Don't worry its fine! So we had more words after that So Windex what do we think??? Is it safe???