The answer to 'how long does window cleaning last' is that the duration of window cleaning can vary depending on several factors. Generally, professional window cleaning can last anywhere from 3 to 12 months, with most homeowners needing their windows cleaned 1-2 times per year. The longevity of window cleaning depends on factors like the climate, window type, and how often the windows are used.
For example, windows in drier climates may only need cleaning once a year, while windows in humid or coastal areas may require more frequent cleaning, such as every 6 months. Homeowners with single-pane windows or frequently opened windows may also need to clean them more often than those with double-pane or tightly sealed windows.