Top-Rated Pressure Washing & Exterior Cleaning in Los Altos, CA
Los Altos' leafy, established lots under heavy oak canopy mean roofs and gutters collect far more organic debris than most South Bay cities — which is exactly what becomes moss if it sits through a wet winter.
Peninsula Exterior Care is a 5-star rated, fully insured professional exterior cleaning company based in Atherton, serving Los Altos and the surrounding Peninsula. We hold a 5.0 rating across 26 Google reviews, we are insured, and we match the cleaning method to each surface rather than running one pressure setting across an entire property.
Peninsula Exterior Care provides pressure washing, house washing and soft washing, roof cleaning, window cleaning, gutter cleaning, solar panel cleaning, and driveway and concrete cleaning throughout Los Altos. We are based in Atherton and match the method to the surface rather than running one setting across an entire property.
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Exterior cleaning services in Los Altos
Every surface outside a home wants a different method. Here is how we approach each one, and what it usually involves on a Los Altos property.
Pressure Washing in Los Altos
Not everything outside a house should be pressure washed, and knowing where the line falls is most of the job. In Los Altos we use genuine pressure on driveways, walkways, patios and other hard flatwork, and switch to low-pressure soft washing the moment we move onto siding, stucco, painted wood or a roof. Same visit, two different methods.
House Washing & Soft Washing in Los Altos
Most of what makes a Los Altos house look tired is organic: algae, mildew and mould growing where shade and moisture sit longest, usually north-facing walls and anything under tree cover. Soft washing removes it properly because the solution kills the growth rather than knocking the top layer off, which is why results last a year or more instead of returning within weeks.
Roof Cleaning & Organic Growth Removal in Los Altos
Roof cleaning in Los Altos is about organic growth, not dirt. Dark streaking on asphalt shingle is typically algae feeding on the limestone filler in the shingle, and moss establishes in valleys and along shingle edges where debris holds moisture. We use low-pressure soft washing with a roof-safe solution. Pressure is never appropriate on a roof: it strips the protective granules off asphalt shingle and cracks tile, and it is usually what voids a manufacturer warranty.
Window Cleaning in Los Altos
Exterior window cleaning here deals with more than dust. Spring pollen bonds into a film, coastal and bay air leaves its own deposits, and hard water from irrigation builds mineral spotting season after season. We clean glass, frames, sills, tracks and screens, and we will tell you honestly when long-term etching will improve substantially rather than disappear.
Gutter Cleaning in Los Altos
Roof and gutter cleaning go together on most Los Altos homes, because the debris in the gutter came off the roof and the algae streaking on the siding is often runoff from the roof above. Doing both in one visit costs less than two mobilisations and gets a better result than either on its own.
Solar Panel Cleaning in Los Altos
Solar panel cleaning matters in Los Altos because of how long the dry season runs. From roughly May to October there is little rain to rinse anything off, so dust, pollen and airborne particulate accumulate uninterrupted for months. We use soft brushes and filtered water — nothing abrasive, and nothing that leaves mineral spotting on the glass as it dries.
Driveway Cleaning in Los Altos
Concrete and pavers are not the same job. Concrete takes real pressure; pavers have joint sand holding the surface together and lose it under too much force, which loosens the surface and opens the gaps to weeds. Paver driveways in Los Altos get controlled pressure and, where it is worth doing, fresh joint sand afterward.
Concrete & Sidewalk Cleaning in Los Altos
The white chalky bloom that appears on Los Altos concrete is efflorescence — mineral salts moving through the slab — and it is worth being straight about: it can be reduced but it recurs, because the cause is moisture inside the concrete rather than on it. Organic staining, by contrast, comes off properly and stays off for a season or more.
Patio & Deck Cleaning in Los Altos
Patio and deck cleaning in Los Altos covers wood, composite, paver and concrete, and each needs a different setting. Wood splinters and loses stain under pressure, composite has a textured surface that holds mildew and a manufacturer pressure ceiling, and pavers lose joint sand. Getting this wrong turns a cleaning job into a refinishing job.
Commercial Exterior Cleaning in Los Altos
For Los Altos commercial property, a recurring schedule usually costs less per visit than letting buildup accumulate for a year and then reversing it. Monthly or quarterly walkway and entry cleaning keeps a property consistently presentable, and we can quote by building or as a property-wide scope for HOAs and multi-unit sites.
What we commonly see on Los Altos properties
Large lots, mature oaks and generous setbacks define most of Los Altos. The tree canopy is the defining factor for exterior maintenance here: more debris in gutters, more shade holding moisture on walkways and north elevations, and more organic staining on hardscape than you would see on an open lot a few miles east. Roof work here is usually about moss in the valleys rather than general dirt.
Common exterior cleaning problems in Los Altos
The common exterior problems on Los Altos properties fall into two groups: organic growth, and staining. Organic growth is alive and needs killing rather than blasting. Staining — oil, rust, tyre marks, mineral deposits — needs the right pre-treatment for the specific stain rather than more pressure. Not every property has all of these — but most have two or three.
- Oil and tyre staining on driveways. Oil soaks into porous concrete rather than sitting on it, so it needs a degreaser and dwell time, not just pressure.
- Spider webs, nesting and entry grime. Eaves, porch ceilings, light fixtures and entryways — the details people see from two feet away.
- Hard water spotting on glass. Irrigation overspray leaves mineral deposits on ground-floor windows that ordinary glass cleaner will not remove.
- Traffic film and general dulling. Airborne dust and pollen that builds through the dry season and flattens the colour of a whole elevation.
- Algae, mould and mildew on siding. Usually worst on north-facing elevations and anywhere under tree cover, where surfaces stay damp longest.
- Roof streaking, moss and lichen. Dark streaks on asphalt shingle are typically algae; moss and lichen establish in valleys and along shingle edges where debris holds water.
How we clean different exterior surfaces
The single biggest decision on any exterior job is how much force a surface can take. Here is how we match method to material.
| Surface | Method we use |
|---|---|
| Stucco | Porous and absorbent. Soft wash only — pressure can drive water behind the surface and open hairline cracking. |
| Vinyl siding | Low-pressure soft wash, worked top-down. Panels overlap, and water forced behind them does not drain or dry well. |
| Painted & wood siding | The gentlest setting we use. Pressure furs the grain and lifts paint unevenly. |
| Fiber cement | Tolerates more than wood but still gets a soft wash rather than pressure. |
| Asphalt shingle roof | Low-pressure soft wash. Pressure strips the protective granules and typically voids the manufacturer warranty. |
| Concrete & clay tile roof | Low pressure, deliberate foot placement on the structural high points of the tile profile. |
| Concrete flatwork | Genuine pressure with a rotary surface cleaner for an even finish, plus pre-treatment on organic growth. |
| Pavers | Controlled pressure to protect joint sand, with fresh sand afterward where it is worth doing. |
| Wood & composite decking | Low pressure with the grain. Composite has a manufacturer pressure ceiling worth respecting. |
| Glass, screens & solar | No pressure. Soft brushes and filtered water so the glass dries without mineral spotting. |
Read the full explanation: pressure washing vs soft washing →
Recent work across the Peninsula
Real photographs from our own jobs — full frames, before and after, nothing cropped to make the angles line up.
Why Los Altos homeowners choose Peninsula Exterior Care
We work in Los Altos regularly rather than passing through. That means we walk the property with you first, use the method each surface actually needs, and tell you honestly when something — old oil, long-set hard water etching, efflorescence — will improve rather than disappear.
Made appointment for 9AM, my clock chimed followed by the doorbell. I expected them to arrive only with a bucket, sponge and squeegee, instead they had state of the art equipment mounted in their vans. The final rinse went through a step to eliminate any water spots and leave the windows sparkling clean. Professional, polite and efficient. A terrific find recommend them to anyone that has similar projects.
Peninsula Exterior Care did an awesome job with our exterior windows. Habib was super professional and courteous. He explained what he was gonna do and was done in time. They have a water softener system and the windows clean out squeaky clean.
We don't always get our windows cleaned, but when we do it will be Peninsula Exterior Care :)
Exterior cleaning FAQs — Los Altos
Is soft washing safe for my landscaping?
Yes. Plants near the work area are pre-wet before we start and rinsed thoroughly afterward, and anything particularly sensitive gets covered. Tell us about it when we walk the property.
How much does pressure washing cost in Los Altos?
It depends on the property rather than the city — square footage, number of storeys, the surfaces involved, how long it has been since the last clean, and access. We do not price by city, and we do not quote a range sight-unseen. Send a few photos or book a walkthrough and you will get a real number, usually the same day.
Is pressure washing safe for stucco?
High pressure is not. Stucco is porous, and pressure can force water into and behind the surface and open up hairline cracking. Stucco gets a soft wash: low pressure plus a detergent that breaks down algae and mildew chemically, with dwell time doing the work.
Should vinyl siding be pressure washed or soft washed?
Soft washed. Vinyl panels overlap, and water driven behind them at pressure does not drain or dry, which is how you end up with mould inside a wall cavity you cannot see. Low pressure and the right solution clean it more thoroughly anyway, because they kill organic growth at the root.
Can pressure washing remove black stains from concrete?
Usually yes, when the black is organic growth — which on shaded Los Altos flatwork it typically is. We pre-treat so the growth is killed rather than knocked back, then surface clean. Mineral efflorescence is different: it can be reduced but it recurs, because the cause is moisture inside the slab.
Can you remove oil stains from a driveway?
Partly, and how much depends on age. Fresh oil usually comes out well. Oil that has been soaking into porous concrete for years typically lightens substantially rather than disappearing completely. We will tell you what to realistically expect before starting, not after.
How often should gutters be cleaned?
Twice a year for most Los Altos properties — once before the wet season and once after. Homes under mature trees often need a third check mid-season. If you only do it once, do it in autumn, because that is the appointment that prevents damage rather than cleaning up after it.
Can you clean solar panels without damaging them?
Yes, with the right method. Panel glass scratches permanently, so nothing abrasive and no harsh chemicals go near it. We use soft brushes and filtered or deionised water, which also means the glass dries without leaving mineral spotting.
Do you clean second-storey homes?
Yes. Two and three-storey elevations, upper windows, skylights and roof work are normal parts of the job, and we bring the access equipment for it rather than skipping what is hard to reach.
Areas we serve near Los Altos
Why homeowners choose us
What makes Peninsula Exterior Care a top-rated exterior cleaning company in Los Altos?
We hold a 5.0 rating across 26 Google reviews, we are a professional exterior cleaning company based in Atherton, and we are fully insured. Every quote is walked with you before work starts, and we match the cleaning method to each surface — soft washing for siding, stucco and roofs, controlled pressure only where a surface can safely take it.
Are you a professional and insured exterior cleaning company?
Yes. Peninsula Exterior Care is insured and we are happy to provide current documentation before work begins. We are an established local company serving the Peninsula, and we bring the same crew and the same standards to every property we work on.
How do I choose a reliable pressure washing company in Los Altos?
Look for three things: verifiable reviews rather than claims, a company that explains which method it will use on each surface, and honesty about what will not fully come out. Old oil in concrete, long-set hard water etching and efflorescence all improve rather than disappear — any company promising complete removal is overpromising.
Do you serve Los Altos regularly, or only occasionally?
We work in Los Altos regularly. We are based in Atherton and cover the Peninsula, South Bay and San Francisco, so this is an area we are in rather than travel to occasionally.
Free quote for your Los Altos property
Send a few details — or a couple of photos — and we'll come back with a price, usually the same day.