SkySWC provides professional soft washing and building wash services for commercial properties throughout Seattle. Soft washing uses low-pressure water delivery combined with professional-grade cleaning solutions to safely remove algae, moss, mold, lichen, and biological staining from exterior building surfaces — without the surface damage risk of high-pressure washing.
Seattle's wet climate creates ideal conditions for rapid biological growth on building exteriors. The black streaks, green algae patches, and moss growth visible on commercial buildings throughout the Seattle area are not cosmetic issues — they are actively degrading your building's exterior surfaces and accelerating deterioration.
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High-pressure washing is the right tool for concrete, parking garages, and heavily soiled hardscapes. For building facades, roofs, siding, and delicate exterior surfaces, it often causes more harm than good — forcing water into gaps, stripping sealants, and damaging softer materials.
Soft washing solves this problem by replacing pressure with chemistry. A professional low-pressure pump delivers a cleaning solution that:
Algae, mold, mildew, lichen, and bacteria are chemically eliminated, not just displaced
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The solution penetrates pores, crevices, and textured surfaces that pressure washing cannot reach effectively
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By killing rather than washing, soft washing prevents rapid regrowth that occurs after pressure washing alone
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Safe for roof shingles, EIFS stucco, composite panels, wood siding, and painted surfaces
We provide ongoing maintenance contracts for high-rises, commercial buildings, hotels, and residential condominiums across King, Snohomish, and Pierce Counties. Our clients trust us because we show up, do the work right, and make their jobs easier.
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The dark streaks visible on building roofs, facades, and siding throughout the Seattle area are primarily caused by Gloeocapsa Magma — an airborne cyanobacterium that thrives in the Pacific Northwest's damp climate. Left untreated, it progressively damages building surfaces:
Soft washing eliminates these organisms at the root, restoring surface appearance and stopping the degradation cycle.
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masonry, brick, EIFS, stucco, metal panel, and composite cladding systems
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flat, low-slope, and pitched roofs including membrane, TPO, metal, and modified bitumen systems
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low-pressure cleaning that does not void manufacturer warranties
safe for all siding materials including Hardie board, fiber cement, and vinyl
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fabric and metal awning cleaning
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biological removal without surface damage
SkySWC uses both soft washing and pressure washing, selecting the appropriate method based on the surface, soiling type, and cleaning objective:
Many commercial projects use both methods in combination — soft washing the facade and roofline, pressure washing the surrounding concrete and flatwork.
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Building facades, roofing, siding, EIFS, painted surfaces, delicate cladding — any surface where high pressure could cause damage
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Concrete, parking garages, hardscapes, loading docks, dumpster areas — surfaces that can handle and benefit from high-pressure water delivery
We invest in equipment that competitors simply do not have. Every tool we use is selected to deliver cleaner windows faster, with less risk to your building and our crews.
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Our soft washing solutions are biodegradable and environmentally responsible. We apply and contain cleaning solutions to prevent runoff into storm drains or adjacent landscaping — consistent with Seattle's stormwater management requirements.
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For multi-story buildings, SkySWC's SPRAT-certified rope access teams and aerial lift capability allow us to reach any elevation for soft washing applications. We do not have the access limitations that prevent many other companies from cleaning above the second or third floor.
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Our crews have maintained exterior surfaces for the Space Needle, Chihuly Garden and Glass, Lumen Field, and many of Seattle's most prominent commercial buildings. KOMO News, KING 5, and KATU have all covered our high-access exterior maintenance work.
Contact SkySWC for a free site assessment and written proposal for your commercial building exterior.
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Soft washing is specifically designed for surfaces that cannot tolerate high-pressure water — roofing, siding, facades, EIFS, and painted surfaces. Our cleaning solutions are selected for compatibility with the specific surface material. We perform a site assessment before every project and will identify any areas requiring special consideration.
Soft washing results typically last significantly longer than pressure washing because it kills biological growth rather than simply displacing it. In Seattle's climate, most commercial building surfaces maintain clean appearance for 12 to 36 months after soft washing, depending on sun exposure, surrounding vegetation, and environmental conditions. Maintenance programs can extend this further.
Yes. Soft washing does not require pressurized equipment that creates impact risk to windows or building components. We coordinate with your property management team to schedule cleaning at times that minimize tenant disruption, and our solutions are applied in a controlled manner that avoids building entry points.
Window cleaning of buildings in Seattle area
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