How do you clean windows on the inside especially those in upstairs?

My husband uses windex window cleaner that hooks to the garden hose. He leaves the screens in and they get clean too. He's been using it for years.

I just saw a product that consists of two pieces. You put one piece on the outside of the window and the other inside. It's magnetic so you wash the outside by moving the piece on the inside. Looked as if it might work, without hanging out of the window!

here are many tools that will help https://www.google.com/search?q=window+washing+tools+from+highrise&safe=active&sa=X&rlz=1C1CHBF_enUS750US750&tbm=shop&tbs=vw:g&ved=0ahUKEwiu_uvm8NPhAhWCITQIHXlJBRMQvQ0IzgI&biw=1366&bih=657

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.

I use half and half plain white vinegar and water, spray on and wipe with a microfiber cloth.