Just FYI, according to
Clean House, Clean Planet, you use distilled water or purified water because it makes your cleaner work better. It has something to do with the way the detergents/borax/baking soda/what have you actually dissolve into the water to become a "cleaner."
For windows and mirrors - my FAVORITE is simply 2 microfiber rags. Wet one with plain tap water and ring it out very well. Use that to clean with, and then go over it again with a dry rag. I do this ala "Karate Kid" wax on...wax off.
It leaves no streaks and it cleans very well!