Serving Sammamish, WA
Sammamish's Exterior Cleaning
& Lighting Specialists
From the shores of Pine Lake to the trails of Soaring Eagle Regional Park, from Klahanie to Sahalee — we know this Plateau because we work here every week.
Proudly serving Klahanie, Pine Lake, Sahalee, Beaver Lake, East Lake Sammamish, and every neighborhood across the Sammamish Plateau.
What the Sammamish Climate Does to Your Home
Drive east on I-90, take the Sammamish Plateau exit, and you enter a different world. The city opens into a landscape of mature Douglas fir and western red cedar, wide lake views, and neighborhoods designed around the natural beauty of the Plateau. Sammamish has earned its reputation as one of the finest places to live in the United States — and the homeowners here have invested accordingly.
But the same Pacific moisture systems that keep the trails at Soaring Eagle Regional Park lush through winter, that fill Pine Lake for summer swimming and evening concerts, and that make the Sammamish Commons farmers market possible every Wednesday from May through September — those same systems create near-ideal conditions for Gloeocapsa magma. That is the cyanobacteria responsible for the black streaking you see on roofs throughout the Plateau. It is not dirt. It is a living organism actively shortening the lifespan of your shingles.
Homes in Klahanie — the beloved master-planned community whose name comes from the Chinook word meaning "out of doors" — sit under some of the heaviest tree canopy on the Plateau. So do the wooded streets around Sahalee and Trossachs, where larger homes and cedar rooflines collect biological growth faster than south-facing open lots. North-facing surfaces, composite decks, cedar fences, and shaded driveways are the most vulnerable — and they are everywhere in Sammamish.
Families throughout Issaquah School District #411 — one of the top-ranked districts in Washington state, anchored here by Skyline High School — have made a serious investment in their Sammamish homes. Annual soft washing is not a luxury here. It is the maintenance interval this specific climate demands, and it is how you protect the investment you have made in one of the most desirable communities in the Pacific Northwest.
Sammamish home — coming soon
Everything Your Sammamish Home Needs
Every service is available throughout Sammamish and links to a dedicated local page.
The Difference Is Visible
Real results from Sammamish and surrounding homes.
Roof Wash — Klahanie
Driveway — Sahalee
House Wash — Pine Lake
Drag the handle to reveal the transformation. Real homes, real results, right here in Sammamish.
What Eastside Homeowners Say
“We recently had our siding cleaned along with our driveway and backyard and I can't say enough good things about this company! From start to finish, they were professional, responsive, and incredibly detail-oriented. Everything looks brand new again! They took their time, made sure everything was done right and left everything spotless when they finished. If you're looking for a company that truly cares about quality and takes pride in their work, I highly recommend them. We'd definitely use them again.”
Kristen W, Google review
“Oh my goodness! PNW Softwash did such an amazing job on our roof and gutters. They even cleaned our chimney and made it look like new. That was an exciting bonus. The appointment was easy to book, and I was able to get them here quickly on my schedule. Their prices are extremely competitive. They arrived on time, were very professional, communicated well and cleaned up before they left. I really couldn't be happier. Their soft wash gently cleaned our roof and they've added years to it's life. I highly recommend.”
K King, Google review
“PNW Soft Wash did an absolutely outstanding job on my brick surfaces. Their professionalism and attention to detail are truly exceptional. They take the time to understand the material they're working with, and their deep knowledge of brick washing shows in every part of the process. What impressed me most is how committed they are to doing the job right. They don't rush, they don't overlook anything, and they go to great lengths to make sure every brick is cleaned safely and thoroughly. You can tell they genuinely care about the quality of their work and the long-term condition of your home. If you want a team that is detail‑oriented, highly skilled, and dedicated to delivering the best results possible, PNW Soft Wash is the company to hire. I couldn't recommend them more.”
I Smiga, Google review
See Us Work in Sammamish
Real footage from Sammamish jobs — coming soon.
Video coming soon
Professional exterior cleaning on Sammamish WA homes including Klahanie, Pine Lake, and Sahalee neighborhoods on the Sammamish Plateau.
Ready to Book in Sammamish?
Join Sammamish homeowners — from Klahanie to Pine Lake to Sahalee — who trust us with their most important investment every year.
Free same-day quotes. A crew that treats your home the way we would want ours treated.
Questions We Hear Most in Sammamish
Honest answers from a Licensed, Bonded, and Insured crew that works in Sammamish every week.
Do you serve all of Sammamish including East Lake Sammamish and newer developments?
- We serve all of Sammamish — Klahanie, Pine Lake, Sahalee, Beaver Lake, East Lake Sammamish Parkway, and all newer Plateau developments. If you are near the Sammamish Commons, in the Skyline High School attendance zone, or anywhere within Issaquah School District #411, you are in our service area. Call or text us and we will confirm your address on the spot. Licensed, Bonded, and Insured. Call (425) 400-9001.
Are you licensed, bonded, and insured?
- Yes. PNW Softwash is fully Licensed, Bonded, and Insured with comprehensive liability coverage. Your property is protected, and you're not liable if anything goes wrong. We carry this coverage not because we have to, but because it's the right thing to do.
What are those black streaks on my roof?
- Those black streaks are Gloeocapsa magma — a blue-green algae that feeds on the limestone filler in asphalt shingles. It literally eats your roof, breaking down protective granules and shortening your roof's lifespan. It's not dirt or pollution. Our Pacific Northwest climate of rain, shade, and moisture creates perfect conditions for this algae to thrive.
How far in advance do I need to book?
- Most services can be scheduled 1–2 weeks out. Christmas light installations book up fast — we recommend reserving your date as early as September. Permanent lighting requires 5–10 business days for system ordering after your free roofline assessment. Contact us early to secure your preferred date.
What is soft washing and how is it different from pressure washing?
- Soft washing uses low-pressure water (165 PSI — your garden hose is about 40–80 PSI) combined with specialized, biodegradable cleaning solutions that kill moss, algae, and organic growth at the root level. Pressure washing blasts surfaces with 2,000–4,000 PSI. For roofs, pressure washing strips protective granules from shingles, forces water underneath, and can void your warranty. Soft washing preserves your roof while delivering results that last 3–5 times longer.