You may spot clean your windows to remove those pesky fingerprints, but when's the last time you really cleaned them? Inside and out? While it does take time, the process is easy. "Use newspaper to clean windows for a streak-free clean," Dewkett suggests. "This is great with vinegar and water." For window screens, she says to remove screens and lean them against a waterproof surface. Next, wash with dish soap and scrub with a hard-bristled brush. Air dry completely before re-installing.