What is the best way to clean windows?

A damp microfiber cloth should produce a streak free finish. Don’t do on a hot, sunny day. I prefer SuperCloth and use it for glass, screens, and appliances. It is similar to the cloth you receive with glasses/sunglasses. It was well worth the investment. They were under $40 for 4 of them about 5 years ago.

I use a microfiber cloth and make my own streak free window cleaner https://www.yourbeautyblog.com/2019/02/diy-homemade-window-and-mirror-cleaner.html

Straight Rubbing/Isopropyl alcohol and clean white wash cloth no fabric softener on it (leaves streaks smears) & no paper towels they are treated with chemicals to increase absorbtion leaves streaks & smears;pour alcohol on cloth & wipe glass. wipe inside one direction-vertically, the otherside -horizontally this way you can tell which side you have missed something. Paper towels are expensive and kill lots of trees to make. Rubbing alcohol evaporates asap and is basically what is in window cleaners minus chemicals and blueing agent & it is much cheaper.

Vinegar and water, using a squeegee & recycled newspaper. Sometimes the old ways are best. I’ve tried *all* the other ways, including alcohol (expensive) & I always go back. Blessings!!!

Here's a post that might help https://chascrazycreations.com/eco-friendly-window-and-mirror-cleaning/

First, take an equal amount of vinegar and water and mix them together in a spray bottle. White distilled vinegar will work best for this. Then, spray the solution on your windows and let it sit for around two to three minutes. Lastly, use a gentle cloth to wipe away the cleaning solution and avoid any streaks.