If your windows always streak after washing:
Steal this tip from the pros: Use a window-washing squeegee with a smooth, soft rubber edge (or crumpled-up black-and-white newspaper—avoid the color sections). Dry a 1-inch strip at the top or side of each window and always start your squeegee there. Starting on dry glass is one key to avoiding streaks. Don’t wash windows in direct sunlight, because quickly dried glass is more susceptible to streaking. Evenings or cloudy days are the best times for window washing.
If your blinds are always dusty:
Use an antiseptic spray. The best way to keep dust from piling up quickly is by applying that spray, such as Static Guard, on the window blinds right after you clean them. If dust is a problem in other parts of your home, other cleaning strategies may be more effective.