Next time, rip a page out of an old newspaper (black and white newspapers only - don't use colored newspapers) and pretend it is a paper towel. Run it under water to wet it entirely and roll it up into a ball to start wiping your mirror with it. It will clean off all the specks of dust and stains off your mirror and it will make your mirror look crystal clear without streaks! I don't know why it works, but it does! It is way better than using windex! Try it! You'll be impressed!