Professional window cleaners typically recommend that residential windows be cleaned at least twice a year. Spring and fall are generally considered the best times for window cleaning, as they correspond to the times of the year when pollen and other outdoor pollutants are at their highest levels. However, if your windows tend to get dirty quickly or you live in an area with high air pollution, you may need to clean them more often. In addition, it’s important to clean windows after major storms or weather events, such as hurricanes or blizzards, as these can deposit dirt and debris on your windows. Following these tips can help ensure that your windows stay clean and clear all year round.