As time passes, dirt, mold, and fungal infections can form on exterior surfaces such as the roof, walkways, or sidewalks. The Granite City Pressure Washing structures can be permanently damaged by outside intrusions like mildew or fungi. Cement is porous and can absorb lots of dirt. To protect the building from dirt and mold, washing is essential. This is important for building exteriors' longevity. It's also more economical than replacing expensive assets.