Aparently sometimes the factory tinting isn't in between the glass, its sprayed on, this was a chrysler minivan from the 90's when they were using a lot of mitsubishi parts.
Ammonia is considered a pretty bad chemical, I wouldn't want to use in inside a car anyway where my nose is inches from the window. They make automotive glass cleaner and we use some of the method stuff as well since its a non toxic cleaner.