House Washing That Makes Your Siding Look New Again

Professional house washing in Seattle and the Eastside — gently lifting green algae, black streaks, mildew, and grime off your siding without the high pressure that damages surfaces. Our soft-wash process cleans vinyl, stucco, brick, and fiber-cement the safe way.

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check_circle Safe soft-wash method
check_circle Algae, mildew & streak removal
check_circle Vinyl, stucco, brick & fiber-cement
check_circle Seattle & Eastside service area

location_on Seattle, WA House washing in Seattle — soft washing siding

bolt Fast Response

Green streaks on the siding? We've often got a slot this week.

Send your address and we'll check availability and send a quote — usually within 1–2 hours during business hours. Same-day and next-day slots open up often.

schedule Quote in 1–2 hrs
event_available Same-day & next-day slots
call Fast, no-pressure callback

Check Availability call +1 (206) 751-6136

Why Seattle Siding Turns Green — and How We Fix It Safely

Seattle's damp, shaded climate is perfect for algae, mildew, and moss to take hold on the outside of your home. That green film and those black vertical streaks aren't just dirt — they're living growth that spreads, holds moisture against your siding, and makes even a well-kept house look tired. A garden hose won't touch it, and blasting it with high pressure can crack siding, force water behind panels, and strip paint.

If you're searching for house washing near me, soft washing, or exterior house cleaning in Seattle, cleanNow uses a low-pressure soft-wash process with the right cleaning solution to kill the growth at the root and rinse it away gently. The result is bright, even siding — and a clean that lasts far longer than a quick rinse, because the algae is actually treated, not just knocked loose.

The Method

What Is Soft Washing, and Why Your Siding Needs It

Soft washing is exactly what it sounds like: cleaning your home's exterior at low pressure — closer to a garden hose than a pressure washer — and letting a cleaning solution do the work instead of force.

Here's the part most people miss. The green film and black streaks on your siding aren't dirt. They're living growth — algae, mildew, and the black streaking caused by Gloeocapsa magma. You can't blast off something that's alive and rooted; you can only knock the top layer loose, and it grows back in weeks.

Soft washing kills the growth at the root with the right solution, then rinses it away gently. That's why a soft wash lasts a year or more while a high-pressure blast looks clean for a month.

What soft washing avoids:

check_circle Cracked siding. High pressure splits vinyl and chips paint.
check_circle Water behind the panels. A pressure washer drives water up under siding, where it sits, rots the sheathing, and grows mold you can't see.
check_circle Stripped finish. Force removes the coating along with the grime.

If a contractor wants to pressure wash your siding, that's the moment to ask why. Siding is a soft-wash job. Always.

How Much Does It Cost to Soft Wash a House in Seattle?

Most Seattle homes land between $255 and $585. We quote a flat price before we start — no hourly meter, no surprises on the invoice.

Single story, up to ~1,500 sq ftfrom $255
Two storyfrom $395
Three story or complex rooflinesfrom $585
Soffits, fascia & gutter faces (add-on)from $75
House + Driveway bundle10% off both
House + Roof bundle10% off both

What moves the price: square footage, number of stories, how much growth needs treating versus rinsing, and access around the house. Bundling with driveway cleaning usually saves you money.

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Every Material, the Right Way

Siding We Clean

Same crew, five different approaches. Knowing which your home needs is most of the job.

Vinyl

The most common siding in Seattle and the most commonly damaged. High pressure at the seams forces water into the wall cavity. Soft washing cleans it without a drop getting behind the panels.

Fiber-cement (Hardie board)

Durable, but its painted surface still chips under pressure and its texture traps algae in the shade. A soft wash brightens it without touching the finish.

Stucco

Porous and unforgiving — pressure blows holes in it and drives water deep into the wall. Stucco is soft-wash only, no exceptions.

Brick

Tougher, but old mortar joints wash out under high pressure. We soft-wash the brick and spare the mortar.

Wood & cedar shingle

Soft, and easy to raise the grain on. Lowest pressure, cleaning solution doing the work.

The Spots That Grow the Most

The siding is what you notice. The growth usually starts where you don't look.

check_circle North-facing walls — never get direct sun, never fully dry. Always the greenest side of a Seattle house.
check_circle Soffits and fascia — shaded, tucked under the roof edge, and the first place mildew takes hold.
check_circle Gutter faces — the black tiger-striping running down the front of the gutter is algae, and no amount of rinsing removes it.
check_circle The entry and porch — the first thing a guest, buyer, or delivery sees, and usually the most weathered.
check_circle Under eaves and around vents — sheltered, damp, ignored.

We clean all of it as part of the wash, because leaving the shaded spots means the growth spreads back across the clean siding within a season.

Before & After

Soft washing does most of its work on things you'd swear were permanent — the green cast on a north wall, the black streaks under the gutters, the tired grey film that made you think the siding needed repainting.

It almost never does. Under the growth is the same color the siding always was. Most homeowners are genuinely surprised how bright their house comes back — and how much newer it looks without spending a dollar on paint.

How Often Should You Wash Your House in Seattle?

Every one to two years for most homes here — more often than a drier climate, because our damp, shaded conditions regrow algae fast.

Yearly if your home is heavily shaded, has a north-facing front, or sits under firs and cedars. Every two years for a sunnier, more open lot.

A proper soft wash that treats the growth rather than just rinsing it buys you the longer end of that range. A quick high-pressure blast puts you back to green by next winter — which is the hidden cost of hiring the cheapest option.

House Washing FAQ

How much does it cost to soft wash a house in Seattle? expand_more

From $255 for a single-story home and $395 for two stories. Larger or multi-story homes cost more. We quote a flat price before we start, and bundling with driveway or roof cleaning takes 10% off both.

What does soft washing a house mean? expand_more

Cleaning the exterior at low pressure — close to a garden hose — while a cleaning solution kills the algae and mildew at the root. It's the opposite of high-pressure blasting, which damages siding and only removes the surface layer.

What do you need to soft wash a house? expand_more

A low-pressure system, the right cleaning solution for the growth and the siding material, and the knowledge of how much dwell time each surface needs. The solution does the work, not the pressure — which is exactly why it's safe.

Is soft washing safe for vinyl siding? expand_more

Yes — it's the only safe method. High pressure cracks vinyl and forces water behind the panels, where it rots the sheathing. Soft washing cleans it with nothing getting behind the siding.

How long does a house wash last? expand_more

A year or more, because the algae is treated at the root, not just rinsed off. A high-pressure wash can look clean for only a month before the growth returns.

How often should I wash my house in Seattle? expand_more

Every one to two years. Heavily shaded homes and north-facing fronts need it yearly; sunnier lots can go two years.

Will it remove the black streaks under my gutters? expand_more

Yes. Those streaks are algae, not dirt, and rinsing won't touch them. They need a soft-wash treatment to come off and stay off.

Do I need to repaint after? expand_more

Almost never. The dull, weathered look is usually growth and film sitting on top of siding that's the same color it always was. Most homes look years newer after a wash with no paint at all.

Do you clean the roof too? expand_more

Yes, and many homes book both — the same soft-wash method cleans a mossy roof safely, and doing them together saves 10%.

See What's Under the Green

Your siding is almost certainly in better shape than it looks. Send us your address and we'll send a flat quote — usually within 1–2 hours during business hours — for a soft wash that treats the growth instead of just rinsing it.

Get a Free Quote Call +1 (206) 751-6136

Licensed & insured · Seattle & the Eastside · Soft wash only, never high pressure