Mix white vinegar 50 - 50 with water and put in a spray bottle. Spray it on generously, let saturate for about 30 seconds and use a microfiber cloth to polish up those windows. It will amaze you.
I have been using this "recipe" for years. Just like you said, it works great; also very inexpensive and environmentally safe. I just purchased some microfiber cloths -- amazing how well they work. Let the sunshine in.........
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