The answer to 'window grimy' is that windows can become grimy due to a buildup of dirt, dust, and grime from the environment. Common causes include airborne pollutants, weather conditions like rain and wind, and improper cleaning techniques. Symptoms include streaks, spots, and a general hazy appearance that reduces visibility and makes the windows look dingy.
For mild grime, homeowners can often clean the windows themselves using a squeegee, glass cleaner, and microfiber cloths. However, for more stubborn buildup or hard water stains, it's best to call a professional window cleaning service. They have the right tools and techniques to safely and effectively restore windows to a crystal-clear shine.