Introduction Most homeowners know when their home looks dirty. Fewer understand why exterior surfaces become stained, what type of cleaning they actually need, or how using the wrong cleaning method can cause damage over time. Exterior cleaning is about more than curb appeal. Proper maintenance can help protect: Siding longevity Roofing lifespan Gutters and drainage systems Concrete and hardscaping Property value Indoor air quality in some situations Whether you own a home in