The best time to wash windows is typically in the spring or fall. Overcast days with mild temperatures are ideal. Spring is great because it allows you to remove the dirt and grime that has accumulated during the winter months. It’s also a good time to remove any pollen or tree sap that may have stuck to the windows. Fall can be a suitable time as well since it’s less likely to rain heavily. It’s recommended to avoid washing windows during very hot or sunny days, as the cleaning solution may dry too quickly and leave streaks. Ultimately, the best time to wash windows may vary depending on your location and specific weather conditions.