What is the best time of year to power wash?

The best time of year to power wash depends on the climate and the surface you are cleaning. In general, the best time to power wash is when the weather is warm and dry. This allows the surface to dry quickly and prevents mold and mildew from forming.
For exterior surfaces, spring and summer are generally the best seasons for power washing. The warmer weather and longer days make it easier to dry surfaces, which is important to prevent mold and mildew growth. Power washing in the fall can also be a good option, as the leaves fall and the weather is usually milder.
In colder climates, where the ground is frozen or covered in snow, it's not recommended to power wash, as the freezing temperatures can cause damage to the surface or the equipment.