Your home's exterior is constantly exposed to dirt, dust, pollen, air pollution, mold, mildew, and algae. While these contaminants build up gradually — often invisibly — they actively work to shorten the lifespan of your siding, paint, and trim. A home that looked fine last spring can be noticeably discolored by fall.
In the Bay Area, the combination of foggy coastal air in winter and dry dust in summer creates ideal conditions for algae and mildew to take hold — particularly on north-facing and shaded walls. Once established, these organisms feed on the nutrients in your siding and paint, accelerating deterioration far faster than simple weathering would.
Professional house washing safely removes years of buildup using specialized equipment and environmentally responsible cleaning solutions — typically restoring a home's exterior in two to four hours.
Low pressure (similar to a garden hose) combined with specialized cleaning solutions. The chemistry does the work, not the force.
Best for: Vinyl siding, stucco, painted wood, fiber cement, EIFS, roofs, and any painted surface.
High-pressure water (1,500–4,000 PSI) to blast away surface debris and grime through mechanical force alone.
Best for: Concrete driveways, brick pavers, stone, and other hard, non-porous surfaces.
Important: High-pressure washing on vinyl siding, wood, or stucco can force water behind panels, damage seals, scar surfaces, and void manufacturer warranties. A reputable company will always soft wash these surfaces.
San Jose & Santa Clara
Every 12–18 months
Dry summers reduce algae; damp winters under oak canopy accelerate growth.
Sunnyvale & Mountain View
Every 12–24 months
Lower tree density and less shade means slower algae cycles.
Los Gatos & Saratoga
Every 12 months
Heavy tree canopy and foothills moisture create ideal algae conditions.
Cupertino & Campbell
Every 18 months
Moderate tree cover. Homes near creeks may need annual attention.
Vinyl, stucco, fiber cement, wood, and brick all cleaned with the appropriate technique.
The horizontal and vertical boards along your roofline — often the first to show algae growth.
Tiger stripes and oxidation removed from gutter faces without damage to paint or finish.
All framing, shutters, and window exteriors hand-rinsed to prevent streaks.
Entry concrete and tile surfaces cleaned to match the rest of the house.
Windows are gently rinsed as part of the process — not detailed window cleaning.
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