So we had our windows tinted a couple of weeks ago and the installer was washing the inside windows with some spray stuff and I looked at him like is that stuff OK if it gets on the carpet, furniture, etc....so he says "Don't worry about what I'm using...It's Johnson's baby shampoo and water...never streaks". The windows turned out awesome (and it's a lot cooler inside) so I washed all the exterior windows at my industrial building and I cannot believe how well it worked. Didn't even rinse, just sprayed on, squeegeed off, and shazam, beautiful clean windows.