Soft Roof Cleaning

Gentle moss & algae removal for PNW roofs

We clean roofs the right way: soft-wash treatment, low-pressure rinsing, and biodegradable solutions that kill moss at the root without damaging shingles, tiles, or metal.

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Why It Matters

What you get with PeakFlow

Shingle-safe soft wash

No high-pressure damage to granules or seals.

Moss killed at the root

Treatment stops regrowth for 2–4 years.

We go on the roof

Proper access and fall protection for every roof job.

Extend roof life

Removes the growth that holds moisture and accelerates wear.

Our Process

Safe, methodical, no shortcuts

  • Inspect roof material, pitch, and moss coverage
  • Protect landscaping and gutters before treatment
  • Apply soft-wash solution to kill moss and algae
  • Low-pressure rinse and remove loose debris
  • Final inspection and optional zinc strip recommendation

Serving Western Washington

Local, fully insured, and trusted across the greater Seattle area.

Why us

Why homeowners choose PeakFlow

A locally-owned, fully-insured exterior cleaning team using the methods manufacturers actually recommend.

Fully insured

General liability + workers' comp. COI available before the job.

Locally owned

Founder-operated in Western Washington. You'll talk to the owner.

Manufacturer-approved method

Pure de-ionized water and soft-bristle poles — safe for panels and glass.

Free re-clean guarantee

If anything isn't right within 14 days of service, we come back and fix it — no charge.

Questions about your property? Call or text the owner directly — (206) 794-9508

FAQ

Common questions

Will roof cleaning damage my shingles or tiles?

No. We use a soft-wash method with low-pressure application and gentle rinsing. No high-pressure blasting that strips granules or lifts shingles.

What types of roofs do you clean?

Asphalt shingle, cedar shake, metal, tile, and flat roofs. We match the treatment to your roof material.

How do you remove moss and algae?

We apply a biodegradable treatment that kills moss, algae, and lichen at the root, then gently rinse away the dead growth.

How long until moss comes back?

A proper soft-wash treatment keeps roofs clean for 2–4 years in Western Washington. Zinc strips can extend that to 5–7 years.

Protect your roof the gentle way

Same-day quote response. Local, insured, and on time.

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