The frequency of professional window cleaning largely depends on environmental factors, building location, and individual preferences. For most residential and commercial properties, a general guideline suggests having windows professionally cleaned at least twice a year. However, buildings in urban areas or near construction sites may require more frequent cleaning due to increased dust and debris accumulation. Additionally, businesses focused on maintaining a pristine appearance may opt for quarterly cleanings to uphold a polished image. Ultimately, the ideal frequency of professional window cleaning should be determined by considering environmental conditions, the building’s surroundings, and the desired level of cleanliness and maintenance.