Professional house washing removes the vast majority of stains, including active mold, mildew, algae, dirt, and organic buildup. However, some deeply embedded stains or actual damage to the siding material may be permanent, especially if neglected for years. The key is addressing problems before they become permanent. Fresh organic growth responds excellently to proper cleaning, while stains that have been present for multiple seasons may have caused permanent discoloration to the siding itself. During the initial assessment, we can identify which stains will likely come out completely and which may require additional treatment or represent permanent damage. We’ll give you realistic expectations before starting any work.