
We specialize in roof washing, window cleaning, soft washing, pressure washing and all exterior cleaning solutions for private homes, resorts, and vacation rentals. We serve Wisconsin Dells, Lake Delton, Baraboo, Portage, Adams, Reedsburg Columbia County, Sauk County, Juneau County, and Adams County!
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Wisconsin Dells draws millions of visitors every year. And with that foot traffic comes real wear on buildings, driveways, and outdoor surfaces. Whether you're a homeowner tucked into the sandstone bluffs, a resort operator managing dozens of guest units, or a downtown business competing for attention along the Broadway strip, the appearance of your exterior makes a measurable difference.
Gunderson Soft Wash provides professional roof washing, house washing, pressure washing, and deck cleaning for property owners throughout Wisconsin Dells and the broader Dells Corridor. We use low-pressure soft washing technology to safely eliminate algae, black streaks, mildew, and biological staining from surfaces that high pressure alone would damage — and our treatments keep surfaces clean for years, not just weeks.
We're not a franchise operation passing through. We're a south-central Wisconsin company that understands local weather patterns, local building styles, and what it takes to maintain a property in a high-humidity river valley environment.

Exterior Cleaning Services in Wisconsin Dells, WI
From rooftops to driveways, we clean every surface on your property the right way — protecting your investment and boosting your curb appeal.
Call for a free quote today!
Our signature low-pressure soft wash safely removes algae, mold, mildew, and bacteria from siding, stucco, fences, and other delicate surfaces — without risk of damage from high-pressure water.
For hard, durable surfaces that can handle high-pressure water (concrete, brick, pavers, and commercial surfaces) pressure washing delivers a deep, powerful clean that removes years of built-up grime and staining.
Those black streaks on your roof are Gloeocapsa magma (an algae) that eats away at shingles over time. Our soft wash roof cleaning eliminates algae, moss, and lichen at the root, restoring your roof's appearance and extending its life. Safe for all shingle types.
Oil stains, tire marks, rust, and algae growth make driveways look neglected. Our pressure washing service lifts deep-set stains from concrete and asphalt driveways, restoring a clean, uniform appearance that makes your whole property look sharper.
Wisconsin weather is tough on wood and composite decks. Mold, mildew, green algae, and gray weathering build up fast. Our deck cleaning service uses the right pressure and the right solution for your deck's material, leaving it clean, safe, and ready for staining or sealing.
First impressions matter for your business. We provide commercial building washing, storefront cleaning, and parking lot pressure washing for Wisconsin Dells businesses of all sizes (scheduled around your hours to minimize disruption).
1 (608) 548-1975 | Schedule Today!
We bring the right equipment, the right chemistry, and local expertise to every job — no national call centers, no subcontractors.
Technique-Driven Restoration. We don't just "pressure wash" - we calibrate our entire system to the specific needs of your property. Our team performs a multi-point surface assessment before a single drop of water hits your home. We utilize selective pressure technology, ensuring that high-impact force is reserved for tough concrete, while sensitive areas like your roof and eaves receive a gentle, chemical-based sanitization. This tailored approach eliminates the risk of water intrusion or surface etching while delivering safe and permanent removal of mold and algae at the core.
A Total Clean with Zero Compromise. We believe a professional service should improve your property, not endanger it. Our eco-responsible cleaning agents are 100% biodegradable, ensuring a safe environment for your family and pets from the moment we arrive to the moment we leave. By utilizing specialized "soak and seal" techniques, we keep our solutions exactly where they belong—on your surfaces—eliminating the risk of runoff or foliage damage. It’s a deep, lasting clean that respects your home and our local environment.
A deeper clean that pays for itself. Frequency matters when it comes to home maintenance. While a cheap "blast and spray" job might look okay today, the organic stains often return by next spring. Our specialized sanitization process is designed for longevity, typically lasting 2–3 times longer than conventional methods. By extending the window between cleanings, you reduce the long-term wear on your surfaces and keep more money in your pocket over the life of your home.
Don’t settle for "fingers crossed" when it comes to your property’s safety. We back every project with full-spectrum liability insurance, providing a safety net that protects both your home and your wallet. Our team is trained in advanced damage-prevention techniques, but our insurance is there to ensure you never have to worry about the "what ifs." Book your service knowing you’re working with a legitimate, protected, and highly-rated local professional.
Wisconsin Dells is built along a dramatic sandstone gorge carved by the Wisconsin River — one of the most geologically distinctive settings in the Midwest. That natural beauty is part of what draws visitors from across the country. But the same river-carved terrain that makes the Dells scenic also creates ideal conditions for rapid biological growth on buildings: dense tree cover, elevated humidity from the river corridor, and shaded north-facing walls that rarely see enough sun to dry out between rain events.
Add to that the sheer volume of activity concentrated in a small geographic area — the Wisconsin Dells Parkway, the Broadway district, and the resort cluster around the waterpark corridor all experience heavy seasonal foot traffic, vehicle exhaust, and cooking fumes from nearby restaurants. Commercial exteriors here can accumulate grime and biological staining significantly faster than a typical small-city property would. For hospitality businesses, that visible deterioration translates directly into guest perception and online review language.
For residential homeowners, many properties in the Dells area sit on sloped terrain with heavy canopy coverage — particularly in neighborhoods back from the main commercial strip. These homes are prone to algae colonization on north-facing roofs and siding, and moss buildup on concrete walkways shaded by mature trees. Annual or biennial exterior cleaning isn't a cosmetic luxury for these properties — it's part of responsible maintenance that protects structural materials and preserves resale value in a market where appearance matters.