Windows are a grim and grimy job, but if you want your house to sparkle, they're where it's at. Even if you "do windows," you probably don't do window screens very often. So, get started by removing all of your screens and propping them up in a place where they can be hosed off. A pressure washer is best if you really want to get all of the dirt and dust out of each little hole. Then, use your pressure washer to hose off the exterior of all the windows. Be sure to get the frames as well as the glass. But wait! You're not done yet. You'll also need to hand wash the panes to make sure they actually get clean and free of streaks. Hopefully, you have windows that tilt so you can get to both sides from safely inside your house. If not, it's time to invest in a tall ladder. Soft cloths seem to work better than paper towels because they don't leave a trail of lint. And a cleaning solution that contains vinegar is less likely to streak.