Roof & House Washing
Roof Softwash & House Washing in the Pacific Northwest
Moss, algae, and mildew don’t stand a chance — without the risk of pressure washing damage.
Why It Matters
Your Roof Is Fighting Moss, Algae, and Mildew Every Season
Living in the Pacific Northwest means dealing with more moisture than just rain. The same climate that makes Washington beautiful also feeds moss, algae, and dark streaking on your roof, siding, and gutters. Left untreated, that organic growth breaks down roofing materials, traps moisture against your home’s exterior, and quietly accelerates wear year after year.
The fix isn’t more pressure — it’s the right cleaning solution, applied the right way.
10,000+
Homes Served
10+
Years in the PNW
5.0★
Google Rating · 600 Reviews
About Our Service
What Is Softwashing?
Softwashing is a low-pressure cleaning method that uses biodegradable solutions to kill and remove organic growth — moss, algae, lichen, and mildew — at the root. Instead of blasting your roof or siding with high pressure, which can strip granules from shingles, crack mortar, and void manufacturer warranties, softwashing lets the chemistry do the work.
Our solutions are safe for your roofing materials, your landscaping, and your family. Results typically last one to three years — far longer than pressure washing alone.
We treat your home’s exterior the same way we’d treat our own: carefully, thoroughly, and with the right tools for the job.
Why Choose Us
Why Washington Homeowners Choose High Point Gutter
💧
No Pressure Damage
We operate at 100–500 PSI — garden hose level. No cracked shingles, no stripped paint, no voided warranties.
🧬
Kills at the Root
Our solutions don’t just remove surface staining — they eliminate the organic growth causing it.
🌿
Environmentally Responsible
Biodegradable cleaning agents that protect your lawn, garden beds, and surrounding landscaping.
🔨
Our Own Crew
Every softwash is done by our own vetted, trained team — no subcontractors, no surprises.
How It Works
Our Softwash Process — From First Call to Final Walkthrough
01
Free Estimate
A High Point Gutter estimator visits your property, assesses your roof, siding, and gutters, and provides a clear, no-pressure quote.
02
Prep & Protection
We protect your landscaping, rinse surrounding plant beds, and prep all surfaces before any solution is applied.
03
Softwash Application
Our crew applies the biodegradable cleaning solution at low pressure, targeting moss, algae, lichen, and organic growth across all treated surfaces.
04
Rinse & Final Walkthrough
We rinse thoroughly and walk through the results with you before we pack up — so you can see exactly what was done.
What You Get
What Softwashing Does for Your Home
- ✓Removes moss, algae, lichen, and dark streaking from roofs and siding
- ✓Extends the life of your roofing materials and exterior paint
- ✓Safe for all surfaces — asphalt shingles, painted wood, composite siding, older brick
- ✓Won’t void your roof manufacturer’s warranty
- ✓Results last 1–3 years vs. months with pressure washing alone
- ✓Biodegradable solutions safe for landscaping, pets, and family
- ✓Protects curb appeal and long-term home value
Reviews
What Washington Homeowners Are Saying
★★★★★
Google Review
“The crew was professional, on time, and my roof looks brand new. I had no idea how much moss had built up over the years. Would absolutely recommend High Point Gutter.”
Sarah M. — Kirkland, WA
★★★★★
Google Review
“They walked me through the whole process before they started, protected my flower beds, and left the place spotless. Great team and great results.”
Mark T. — Bothell, WA
★★★★★
Google Review
“Very easy to work with from start to finish. The estimator was honest, the price was fair, and the softwash made a huge difference on our siding. Will use them again.”
Jennifer R. — Everett, WA
★★★★★ 5.0 Stars across 600 Google Reviews View All Reviews →
Pricing
What Does Softwashing Cost?
Softwashing costs vary based on the size of your home, the surfaces being treated, and the extent of organic growth. Most residential softwashes in King, Snohomish, and Pierce County range from $1,000 to $2,000, depending on the size and pitch of your roof, with siding and gutter cleaning available as add-ons.
Every estimate is free and comes with zero pressure. Our estimators give you a clear, honest quote before any work begins — no hidden fees, no surprises. And if softwashing isn’t the right solution for your home, we’ll tell you that too.
FAQ
Common Questions About Softwashing
Is softwashing safe for my roof shingles?
Yes. We use 100–500 PSI — similar to a garden hose — paired with biodegradable cleaning solutions. It’s actually the cleaning method most roofing manufacturers recommend, because it doesn’t strip granules or damage shingles the way pressure washing does.
How long do softwash results last?
Typically one to three years, depending on your local environment, tree coverage, and rainfall patterns. Homes in heavily shaded or high-moisture areas of Washington may see organic growth return more quickly.
Will the cleaning solution hurt my lawn or plants?
We protect surrounding landscaping before any solution is applied and rinse plant beds and grass as part of our standard process. Our cleaning agents are biodegradable and designed to break down safely after application.
Can softwashing remove moss from my roof?
Yes — and it goes further than surface removal. The solution kills the root structure that moss uses to anchor itself to your shingles, which means it takes significantly longer to grow back than if you simply scraped or pressure-washed it off.
What’s the difference between softwashing and pressure washing?
Pressure washing uses high-force water (often 1,500–3,000+ PSI) to physically blast away dirt and growth. Softwashing uses low pressure and specialized solutions to chemically break down organic growth at the biological level. Softwashing is safer for delicate surfaces and produces results that last much longer.
Do I need to be home during the softwash?
Not necessarily. As long as we have access to the areas being treated and a water source, our crew can complete the job while you’re away. We’ll send before-and-after photos and follow up once the work is done.
Get a Free Consultation & Estimate
Ready for a Cleaner, Healthier Exterior? Let’s Talk.
Our team serves homeowners from Bellingham to Olympia. Book a free estimate and let us show you what softwashing can do for your home.
Softwash vs. Pressure Washing
Why Low Pressure Outperforms High Pressure on Pacific Northwest Roofs
It seems counterintuitive — shouldn’t more pressure mean a cleaner result? For concrete and pavement, maybe. But for roofs, painted siding, and older masonry, high pressure causes more damage than the moss and algae it’s removing.
Pressure washing blasts away surface growth but leaves the root system intact. It strips granules from asphalt shingles, can force water under siding into wall cavities, and often voids roofing warranties. Growth comes back within months.
Softwashing works differently. The cleaning solution breaks down organic growth at the biological level — killing spores, roots, and bacteria rather than just removing what’s visible on the surface. Results hold longer, and your exterior materials stay intact.
For homeowners in the Pacific Northwest, where rainfall and humidity create near-constant conditions for moss and algae, softwashing is the smarter long-term investment.
Roof Moss & Algae
Why Washington Roofs Struggle with Moss — and What You Can Do About It
Washington’s climate is ideal for nearly everything — including moss. High annual rainfall, mild temperatures, and tree canopy that shades rooftops create perfect conditions for organic growth to take hold.
Moss — The most common problem on PNW roofs. Moss holds moisture against shingles, accelerates granule loss, and can work its way under shingles over time, creating leak points.
Algae (Black Streaking) — That dark streaking on many roofs isn’t dirt. It’s a type of algae that feeds on limestone in asphalt shingles. Softwashing removes it completely.
Lichen — Harder to remove than moss or algae, lichen bonds directly to roofing material and requires a chemical solution — not pressure — to release without causing damage.
Mildew and Mold — Common on north-facing siding and in shaded areas. Our biodegradable solutions kill mold and mildew at the source, not just the surface.
The good news: all of these are treatable. Regular softwashing — every one to three years — keeps your roof clean, extends its lifespan, and protects the investment you’ve already made in your home.
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