Roof cleaning in Bellingham, WA

Soft washing uses low pressure and specialized cleaning solutions to safely remove organic growth like moss, algae, and mildew. Unlike traditional pressure washing, which relies on high pressure to blast away dirt, soft washing kills growth at the root so it doesn't come back as quickly. It's the right method for delicate surfaces like roofs, siding, and painted wood.

Our roof cleaning process uses a sodium hypochlorite-based solution that begins breaking down shortly after application. When diluted with water and exposed to sunlight, air, organic matter, and soil, sodium hypochlorite naturally degrades into simple salt compounds and water. We take care to apply our cleaning solutions responsibly and follow industry best practices to minimize runoff and protect surrounding landscaping throughout the cleaning process.

We take several steps to protect your landscaping. Plants are rinsed before, during, and after the service. Water dilutes the cleaning solution, and once diluted it drains safely into the ground. Pets should stay indoors during the service as a precaution. Once the area has been rinsed it's safe again.

Most roofs benefit from a professional cleaning every 1–3 years, depending on shade, nearby trees, and moisture exposure. Regular cleaning prevents moss from damaging shingles and can extend the life of your roof.

Two: a zinc powder treatment for preventive maintenance when there's not much active growth (apply yearly to keep moss from establishing), and a full soft wash using a professional cleaning solution when a roof has visible moss, algae, or heavy buildup. A proper soft wash typically keeps a roof moss-free for 3–5 years.

Never. High pressure damages shingles, voids warranties, and shortens roof life. We use a specialized soft washing process that safely removes moss and algae without harming the roofing material.

Every property is different, but here's what most jobs run: roof cleaning $300–$600, house washing $350–$700, gutter cleaning $200–$400, pressure washing (driveways, patios, walkways) $200–$450, and window cleaning $200–$400. Send a few photos of your property and we can usually give you an accurate number before we ever show up.

We use proper safety equipment and professional techniques: specialized footwear, ladder stabilizers, and fall protection harnesses when needed. In many cases we can treat the roof from ladders or the ground using specialized soft-washing equipment, so we're not on the roof at all.

Asphalt, metal, clay and concrete tile, slate, cedar shake, composite/synthetic shingles, and flat systems like TPO, PVC, and torch-down. Each material needs a slightly different approach. We adjust our process and solutions to clean safely without damaging the roof.

Look for dark streaks — that's *gloeocapsa magma*, a cyanobacteria that eats the granule coating off asphalt shingles. Green or orange tinge from moss and lichen is the other obvious sign. If your roof is more than 5 years old and hasn't been cleaned, there's almost certainly growth establishing even if you can't see it clearly from the ground — moss roots in the PNW fast. An early clean is much cheaper than waiting until you have visible damage.

Yes — consistently. A roof replacement in Whatcom County runs $8,000–$20,000 depending on size and material. A professional soft wash every few years costs a fraction of that and can add 5–10 years to the life of your shingles by killing the moss and bacteria that break down the surface. Insurance adjusters and buyers' inspectors flag heavily mossy roofs, which can complicate claims and sales. It's one of the highest-ROI maintenance items on a home.

A professional soft wash — the right concentration of sodium hypochlorite, applied correctly and allowed to dwell — typically keeps a roof clean and moss-free for 3–5 years in the Pacific Northwest. Pairing it with an annual zinc powder treatment can push that window longer. Product-only approaches like Wet & Forget work more slowly and don't hold up as long as a professional application.

Late spring through early fall — May through September — when we have dry stretches long enough for the cleaning solution to dwell and do its job. Constant winter rain can dilute a treatment before it fully sets. That said, we work year-round and will time any off-season job around a rain-free window. If you're prepping for a sale or inspection, don't wait for the "perfect" season — call and we'll work around the weather.

The industry standard is a diluted sodium hypochlorite solution — the same active ingredient in bleach, but applied at the right concentration with a surfactant that makes it cling to the surface long enough to kill *gloeocapsa magma*, moss, algae, and lichen at the root. We never use high-pressure washing on roofing material — it dislodges the granule coating on asphalt shingles and voids most manufacturers' warranties.

Technically yes, but it's one of the higher-risk DIY jobs around a home. Working on a pitched, wet roof is dangerous — falls are the leading cause of DIY injury. Too-strong bleach damages shingles; too weak and you won't kill growth at the root. If you do attempt it: use proper fall protection, never use a pressure washer on shingles, apply from a ladder or the ground using a pump sprayer, and rinse your landscaping thoroughly before and after. For most homeowners, the cost difference between DIY and hiring a professional is smaller than expected.

Safety and insurance are the biggest cost drivers — working at height requires proper equipment (ladders, stabilizers, harnesses, fall protection) and the liability coverage to back it up. The cleaning solution itself (sodium hypochlorite, surfactants) has real materials cost, and a thorough treatment takes more time than it looks: proper application, dwell time, rinsing, and protecting your landscaping throughout. When you compare it to a roof replacement, even a premium cleaning job is a small fraction of that cost.

Wet & Forget works — but slowly. It relies on rainwater to activate and spread, and results can take 3–6 months to show. It doesn't remove existing moss and staining; it kills growth gradually over multiple rain cycles. A professional soft wash removes visible staining in a single visit and kills growth at the root the same day. For light preventive maintenance between professional cleanings, Wet & Forget is a reasonable tool. For a roof with active moss or heavy *gloeocapsa magma* staining, a professional wash is faster, more thorough, and holds up longer.