Ok so the morons my GF bought her Taurus from put Rain-X on the INSIDE of the windshield. At least I think it's Rain-X, trying to clean the window it acts just like Rain-X does on the outside.
I have tint on my windows so I can't use ammonia based cleaner, so I don't have any.
Think real live Windex with ammonia would cut it off? If not what's the quickest way?