Moss Removal & Treatment Services About Reviews

Exterior cleaning experts

Professional exterior cleaning throughout Gig Harbor, Port Orchard, Silverdale, and surrounding areas.

From roof and gutter cleaning to window cleaning, house washing, pressure washing, moss removal, and Christmas light installation, we treat every home like our own.

Request a free estimate See moss removal & treatment

Call now: (253) 514-9859

Fully insuredFree no-obligation estimateBefore & after photos

Jimmy from Polwarth Exterior Cleaning standing beside the company van

Moss Removal & Treatment

Roof clean, moss treatment, maintenance — a year of roof care.

Moss keeps coming back, so we treat it as a programme, not a one-off. Three visits a year keep the roof clean and the gutters clear of debris and draining properly.

Spring

Roof Clean & Soft Wash

An initial roof clean — we brush the moss off, then apply a roof soft wash that stops moss growth and restores the roof.

Summer

Moss Treatment

The moss treatment works to kill any remaining moss and add years to the life of the roof.

Autumn

Maintenance

We return to blow off any debris that has accumulated and clean out the gutters, keeping the roof clear through the wet season.

Explore Our Services

Professional exterior cleaning services that keep your property looking its best.

Roof and moss are the core. These round out the job when you need them.

A ladder and brush beside a shingle roof slope half covered in thick green moss

Moss removal & treatment

Moss scraped off the roof, then treated so it doesn't come straight back.

Spotless floor-to-ceiling windows on a lakefront home

Window cleaning

Streak-free glass, inside and out, on request.

Clean solar panels on a shingle roof with tall trees behind

Solar panel cleaning

Panel washing that lifts the dust, pollen and bird mess that quietly costs you output.

A concrete landing half cleaned, a bright washed path cut through dark algae with a surface cleaner in the foreground

Pressure washing

Decks, driveways, patios and concrete washed back to their colour.

A clean sage-green two-storey house with bright white trim and a fresh wooden deck among tall trees

House softwashing

Render, cladding and siding washed with low pressure and the right solution — the dirt lifts, the paint stays.

A deck half restored, clean warm wood on one side and weathered grey on the other

Deck restoration

Weathered boards cleaned back and re-oiled, so the deck lasts another season.

A white house at dusk with multicoloured lights along the roofline, hedge and driveway

Christmas lights

Installed in December, taken down in January.

Permanent lights

A discreet track fitted along the roofline — warm white year-round, holiday colour when you want it.

Photos of work

Before and after, in the same light.

Close-up of asphalt shingles with thick moss growing along every shingle edge — Moss thick along every shingle edge and the gutter packed — then the shingle faces cleared and the gutter running free.

The same roof with clean shingle faces and a clear metal gutter running along the edge — Moss thick along every shingle edge and the gutter packed — then the shingle faces cleared and the gutter running free.

Two panels: the roof thickly mossed before treatment above, the same roof cleaned with white treatment bands below — Moss removal and moss treatment — the mossed roof above, the same roof cleaned and treated below.

Two panels: a garage roof covered in moss and needles above, the same roof clean below — Moss and needles thick across the garage roof — then every shingle cleared.

Two panels: a house roof patched with moss above, the same roof clean below — Moss creeping over the whole slope — then the roof cleaned back to bare shingle.

Side by side: a roof covered in needles and debris, then the same roof cleared — Needles and debris heaped along the gutter line — then the roof cleared and the gutter emptied.

Two panels: a roof dusted with lichen and moss above, the same roof cleaned with white treatment bands along the ridges below — Lichen and moss across the slope — then cleaned, with treatment applied along the ridges.

Two panels: a weathered grey deck above, the same deck restored to a warm golden finish below — Greyed, weathered boards — then cleaned and oiled back to a warm finish.

Two panels: a greyed garden deck with benches above, the same deck cleaned and brightened below — Greyed, weathered boards — then cleaned and oiled back to a warm finish.

Two panels: a weathered lakeside deck above, the same deck oiled to a rich brown below — Weathered grey decking above the water — then cleaned and oiled.

Two panels: a greyed deck with cable railings above, the same deck oiled dark below — Weathered grey decking above the water — then cleaned and oiled.

Two panels: weathered grey deck steps above, the same steps stained a deep red below — Worn steps and rails — then cleaned and stained, cable rails included.

Side by side: worn deck steps, then the same steps cleaned and stained — Worn steps and rails — then cleaned and stained, cable rails included.

Spotless floor-to-ceiling windows on a lakefront house — Three recent window jobs — lakefront glass, a commercial front, and a full house.

A row of clean commercial windows with blinds — Three recent window jobs — lakefront glass, a commercial front, and a full house.

Clean solar panels on a shingle roof under a blue sky — Panels washed back to clear glass, ready to catch everything the sky gives.

A bank of clean solar panels on a shingle roof — Panels washed back to clear glass, ready to catch everything the sky gives.

Two panels: garage doors covered in spray-paint tags above, the same doors clean below — Tagged garage doors — then washed back to clean white.

Two panels: a driveway covered in yellow moss above, the same driveway clean below — A driveway gone yellow with moss — then pressure-washed back to clean concrete.

A clean house exterior with grey siding and a tidy roof among tall firs — A full exterior softwash — siding and trim cleaned without disturbing the paint.

An outbuilding roof thick with green moss between the shingles — Moss across every shingle of the shed roof — then the whole slope cleared back to bare shingle.

The same outbuilding roof after moss removal, shingles clean and even — Moss across every shingle of the shed roof — then the whole slope cleared back to bare shingle.

A two-storey house roof covered in thick reddish-brown moss — Thick reddish-brown moss over the whole slope — then cleaned, and treated so it stays off.

The same house roof after moss removal and treatment, shingles clean — Thick reddish-brown moss over the whole slope — then cleaned, and treated so it stays off.

White moss treatment spread across mossy roof shingles — Treatment worked into the shingles after the scrape, so the moss doesn't come straight back.

A window with visible streaks and cobwebs before cleaning — Streaks, spots and cobwebs on the glass — then washed right through and dried clear.

A large exterior window covered in dirt and water spots — Streaks, spots and cobwebs on the glass — then washed right through and dried clear.

Purple permanent lights along the deck and roofline of a house at dusk — One track along the roofline, three views — purple across the gables, deck and eaves.

A house exterior at night lit with bright purple permanent lights — One track along the roofline, three views — purple across the gables, deck and eaves.

A ladder leaning against a house beneath a mossy roof, ready for a roof clean — Ladder up, moss in plain sight — the roof before a full clean and gutter clear.

A freshly stained wooden deck railing with cable infill and a clean walkway behind — Weathered timber cleaned and stained — rails, steps and cable infill included.

A pressure washer surface cleaner cutting a clean line through algae-stained concrete — Algae-dull concrete — then a clean path cut straight through it with the surface cleaner.

Finished work

Two short clips — a stone path washed bright again, and a waterfront pier cleaned back to pale timber.

Finished work

Two short clips from a finished deck and walkway job — stained rails and cable infill, clean underfoot.

A commercial building at dusk with blue holiday lights strung along the roofline — Blue lights strung along the rooflines of local businesses — pharmacy, tap room and harbour offices.

A harbour health building outlined in blue holiday lights at night — Blue lights strung along the rooflines of local businesses — pharmacy, tap room and harbour offices.

A tap room exterior at night with blue lights tracing the roofline — The same rooflines once the sky goes black — if anything, better.

A local business building at night with blue holiday lights along the roof — The same rooflines once the sky goes black — if anything, better.

Through the year

Right job, right season.

Spring

Moss treatment

Best time to apply the biocide before growth resumes.

Summer

House & patio

Washing work dries fast in the dry weather.

Autumn

Gutter cleaning

Clear the leaves before the first hard frost.

December

Christmas lights

Installed and taken down — no ladders on your side.

Jimmy Polwarth standing beside the Polwarth Exterior Cleaning van

Jimmy Polwarth — owner, Polwarth Exterior Cleaning

About the owner

Polwarth Exterior Cleaning is owner-operated, so you’ll work directly with Jimmy from quote to completion. He handles every job personally and treats your property like his own.

From roof and gutter cleaning, moss removal and treatment, and window cleaning to house softwashing, pressure washing, deck restoration, solar panel cleaning, and seasonal lighting, every service follows the same standard: protect your landscaping, take care of your property, clean your gutters thoroughly, and leave your home looking like new. We take pride in every job and treat your property like our own, paying attention to the details and leaving everything clean, tidy, and looking its best.

“He showed up on time and delivered as contracted… Hats off to him.”
Kubla

Locally owned and operated

Fully insured, licensed and bonded

Free, no-obligation estimates

Get a free estimate

Neighbors say

“Jimmy's communication was clear, friendly, and professional. His pricing was very reasonable, he followed through on everything we discussed, and the quality of his work exceeded my expectations. I highly recommend Polwarth Exterior Cleaning.”

Josh Turner — The Good Grandson, LLC

“Reasonable price. He power washed the exterior of our house and it's fresh like a new paint job! All exterior windows plus skylights are crystal clear. Jimmy is very thorough and meticulous in his work — recommend to all!”

Jacqui Starr

“People who've seen my Iron Wood decks can't believe how beautiful they are — the products you used brought out the beauty of the wood and made it look almost new, and it's 17 years old! Having you do my windows was a great choice too. All clear after rain or shine. Thanks for a great job all the way through.”

Al Howe

“My experience with Jimmy was phenomenal. He showed up on time and delivered as contracted, soft-washing my lake house and cleaning years worth of moss, pollen and dirt off — scrubbing the soffits and siding with a brush — then did my metal roof, gutters, and windows inside and out. He worked non-stop for 10 hrs. Hats off to him. His pricing was very reasonable and he has the right professional setup for a variety of cleaning jobs. I highly recommend him.”

Kubla

“Jimmy did a superior job of cleaning our gutters until they gleamed, and sealed leaky corners. He then tackled the biggest job — restoring our deck — bleaching and pressure washing, then stripping the old, stuck-on finish before sealing it. That was a tough job and Jimmy stayed at it until it was right. He cleaned the exterior of all our windows, even the skylights, and cleared spider webs and debris off the downspouts. Great attention to detail — I'll be calling him again.”

Phyllis S

“Our project was a big cleanup with many delays on our part, and we were so appreciative that he hung in there with us — his work is exceptional! He took before and after photos for the records, and even repaired a small hole in our shed roof after his cleaning exposed it. He cleaned our roofs, gutters, siding and windows inside and out. It's refreshing to find someone with a strong work ethic who takes pride in his work and is prompt in responding. We highly recommend him.”

Lindy Lincoln

“Great experience with Jimmy. He pressure washed the sea of concrete around our house and did a masterful job on the Trex deck — best it's looked since it was built. Jimmy is professional, communicates well, shows up when promised, and does excellent work. Fair and reasonable prices to boot.”

Sharon Howard

“Came home today to amazing and sparkly clean windows in my three-story house with skylights! This house is a challenge and we are grateful to have found someone so capable. He also cleaned off the roof, which, though I can't see it, I know is also very clean! Very professional, detail oriented, thorough, and does a great job cleaning up afterwards.”

Kimberly Alness

“Jimmy did such a great job on our lights! His communication and pricing were clear, he showed up when he said he would, and he beat the best previous estimate we had. Best of all, the finished product was exactly what we were looking for. Thank you Jimmy for helping us make this Christmas magical!”

Jenna

“Jimmy has been absolutely fantastic. I reached out for holiday light hanging — he responded quickly, got my lights up faster than I expected, and is storing them for us until next year. I also used him for roof cleaning and moss prevention, and once again he was quick to respond and came out two days later to complete the job. Highly recommend!”

Alyssa

Free estimate

Tell us about the roof. We'll do the rest.

No obligation, no pushy follow-up. We'll call or email back within a working day to arrange a look.

Local coverage — ask if you're nearby

Fully insured, licensed and bonded, references on request

One local operator, not a call centre

Prefer to talk?(253) 514-9859

Call now Free estimate