The longevity of clean windows varies based on several factors, including environmental conditions, maintenance, and materials. Typically, professionally cleaned windows can maintain their clarity and cleanliness for around six months to a year, especially if routine maintenance is upheld. However, in areas prone to heavy pollution, dust, or inclement weather, the cleanliness may degrade more quickly, necessitating more frequent cleaning. Additionally, the quality of materials and installation can influence durability. High-quality windows with proper sealing and coatings may remain clean longer. Regular upkeep, such as periodic cleaning and inspection for damage, can help prolong the lifespan of clean windows, ensuring they maintain their clarity and functionality for years to come.