How often should residential siding be professionally cleaned?

How often should residential siding be professionally cleaned?

Most residential siding benefits from professional cleaning once a year, with twice a year being appropriate in humid climates or heavily shaded properties where algae and mildew develop faster. Annual cleaning prevents the kind of buildup that becomes significantly harder, and more expensive, to remove once it’s had a year or more to set into the surface. Homes near trees, in coastal areas with salt air, or in regions with high humidity often need more frequent attention than homes in drier climates. Beyond appearance, regular cleaning actually protects the siding itself, since algae, mold, and grime buildup can gradually degrade surface finishes and shorten a siding’s usable lifespan over time. If you notice visible green or black streaking developing, that’s usually a sign your specific home needs more frequent cleaning than the general annual guideline.