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After washing windows or mirrors take a white board eraser and go over it with that. You'll be thrilled and amazed! We have all had fun trying to rid ourselves of streaking windows and mirrors. Sure newspaper works, but gets ink all over you. And coffee filters are small and it's tricky to keep it gliding smoothly over the surface of things. Just erase those pesky streaks away!
I found this by accident when wiping a blender "spray" on my kitchen window. I used a Mr. Clean Magic Eraser which was right there to clean it up. The window was spotless, no streaks etc. So, then I tried it on my glass doors and was I amazed. Needless to say, I went around the house doing mirrors windows.
Use vertical strokes when washing windows outside and horizontal for inside windows. This way you can tell which side has the streaks. Straight vinegar will get outside windows really clean.