Here’s a recipe I found somewhere that I really like for homemade window cleaner.

1 cup water
1 cup rubbing alcohol
1 tbsp. vinegar (I estimate this)

Pour into a spray bottle, label, and use. It is cheap, and it works. Okay, not quite as well as Windex, but it smells better, and it does work. You can use a newspaper to buff at the end if you want. Seems to help. But I usually just use a clean, dry cloth and it works pretty well. Doesn’t streak if I make sure it’s dry before I move on.