Many homeowners overlook the cleanliness of their windows, but there are many reasons you should have your windows professionally cleaned. Some reasons include: Cleaning your windows helps to prevent glass degradation from acid rain and hard water. Dirt and mold particles on your windows can diminish air quality which cleaning can help remove. Excess dirt, grime, and particle buildup can lower your window’s heating efficiency. Ensuring your windows are cleaned regularly can help improve your property’s heating efficiency.