We recommend that you power wash your home at least once a year to help protect it from harmful mold, algae, or other contaminants. However, you may need to power wash your home more than once, depending on your situation, such as if you live in an area with a lot of construction, you have sustained storm damage, you will be painting your home, or you are putting your home up for sale. An annual power wash is usually sufficient for the majority of other surfaces