Here are a couple tips for cleaning windows inside and out. I have always been a fan of using newspaper to clean my windows on the inside. It is something you can get for free, if not a lot cheaper that paper towels. Some people might say that the ink in the newspaper runs or smears on the window, but I have never had that problem.
Cleaning the windows on the outside is a little different. I like to use the garden hose, a old scrub brush, an environmental friendly glass clean and a car shammy. What’s nice about the shammy is its re-usable. Clean your window, dry off the window with the shammy, ring out and give it one final dry.