Just as is stated on the lable Gunk does not leave any streaks, it is safe (as far as I can tell) on tinted windows, and it removes bugs and film from every glass surface I have used it on! I originally bought Gunk for my car windows after driving through Virginia and getting some pretty nasty guts on my windshield from all the bugs. But occasionally my mirror in my bathroom needed to be cleaned so I would whip out the Gunk and it made my mirror clean as ever. I also paint in my spare time and I use a sheet of glass as my palete and don't you know it! it works perfectly on that as well, removes all my acryllic paints from the glass and even cleans my palete knife! I threw out all of my windex products because I love this one product so much, it's effective, cheap, and doesn't smell as harsh as many other products do, with or without ammonia. So if you have any dirty windshields or maybe your significant other left you a note on your bathroom mirror that you just can't seem to get off ;), use Gunk and it'll be off in a jiffy!