Unfortunately using glass cleaner to clean cars is a common mistake made. Heck if you go on YouTube and watch one of Phil Boler's videos for Production Car Care he goes to a detail shop to ask them to try his new spray polish compared to what they already use. The guy at the detail shop cleaned the paint with glass cleaner before trying each product. The fact that Boler just watches the guy use glass cleaner and says nothing makes me wonder if he knew any better.
