I clean windows. I have to. I have a cat in the house and cats on the outside that smudge my patio doors. They are either putting nose marks on it or paw prints. God love them!
I use to clean my windows with newspaper and Windex, which I thought made a mighty sparkling clean window. But now, a friend told me about using those micro cloths that you can buy in the auto section. Those are great! Use a wet one with plain water for cleaning the glass and a dry one for wiping off. It is so clear that it can be dangerous!