2026–2027 Winter Rain Readiness
Prepare before the first major stormClear gutters, roof debris and visible downspout restrictions during dry weather.
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BAY AREA ROOF CLEANING · SOFT WASH SPECIALISTS
Roof Pressure Washing
the safe, documentation-focused way.
High-pressure roof washing can damage shingles, affect warranty coverage, and create avoidable maintenance concerns. We use material-appropriate low-pressure methods aligned with published manufacturer guidance where applicable.
165+
Five-Star Reviews
local
Liability Insured
Since 2017
Serving the Bay
Low
Pressure Care
Pressure washing vs Soft washing
The difference every Bay Area homeowner should know
Searching for “roof pressure washing”? Read this first — because traditional pressure washing is exactly what you don't want on your roof.
Traditional Pressure Washing
Why high pressure destroys roofs
Traditional pressure washing can use 2,000–4,000 PSI — enough to carve wood and strip paint. That level of force can be inappropriate for roofing materials and details.
- Strips granules off composition shingles (visible black streaks)
- Forces water under clay and concrete tile, rotting underlayment
- Loosens moss but leaves its root system, causing faster regrowth
- Can conflict with published manufacturer care and warranty terms
- Can create concerns when insurers review visible roof condition
- Costs thousands in premature roof replacement
Soft Wash (Our Method)
How we clean roofs safely
Soft washing uses lower pressure with cleaning solutions selected for the roof material, condition, and type of organic buildup.
- Uses lower pressure to reduce the risk of surface wear
- Methods adjusted for composition, tile, cedar, and metal roofs
- Targets moss and algae beyond a surface-only rinse
- Supports manufacturer-conscious cleaning; specific warranty terms vary
- Supports a cleaner, better-documented roof condition
- Helps remove moisture-holding organic buildup
What we remove
The four things killing your roof
Bay Area moisture, fog, and tree cover make roofs a prime target. Here's what we eliminate on every job.
Black Streaks (Gloeocapsa Magma)
Those dark vertical streaks aren't dirt — they're algae colonies that feed on limestone filler in shingles.
Damage: Shingle degradation, heat retention
Moss
Green moss pads hold moisture against your roof 24/7, rotting underlayment and lifting shingles off nails.
Damage: Water intrusion, shingle failure
Algae & Lichen
Lichen is the worst — it bonds to shingle granules and requires specialized detergents to fully remove.
Potential concern: persistent staining and surface deterioration
Debris & Buildup
Leaves, pine needles, bird droppings, and tree sap trap moisture and create ideal conditions for regrowth.
Damage: Gutter clogs, moisture pockets
Every roof, the right way
Roof types we clean
Your roof type determines the exact method. We train on every common Bay Area roof material.
Composition Shingles
Soft WashThe most common Bay Area roof. Lower-pressure methods reduce the risk of granule loss; manufacturer warranty terms should be confirmed for the specific roof.
Pressure: Under 300 PSI · Chem: SH-based soft wash
Clay & Concrete Tile
Soft Wash + RinseCommon on Mediterranean and Spanish-style homes. Tiles are strong but grout and underlayment are vulnerable to high pressure.
Pressure: Under 500 PSI · Low-angle application
Cedar Shake
Gentle Soft WashNatural wood roofs common in Peninsula estates. Requires wood-safe detergents and extra care around splits and cupping.
Pressure: Under 200 PSI · Wood-safe chem
Metal & Standing Seam
Soft WashIncreasingly popular in new Bay Area builds. We use pH-neutral detergents to protect painted metal finishes.
Pressure: Under 500 PSI · pH-neutral detergent
Slate
Specialty Soft WashHigh-value estate roofs. Slate itself is tough, but flashing and mortar joints demand careful technique.
Pressure: Under 300 PSI · Joint-safe method
Flat / Low-Slope
Soft Wash + Debris RemovalCommercial and modern residential roofs. TPO, EPDM, and modified bitumen each get a tailored approach.
Pressure: Varies by membrane type
Our process
How a Miller's roof wash goes
Scheduled, explained, and done right. Most roofs finish in 3–5 hours.
1
Free inspection & estimate
Send photos or schedule a walk-through. We identify roof type, measure square footage, note trouble spots, and send a firm written quote. No surprises.
2
Property protection
Before any chemistry hits the roof, we protect landscaping, cover electrical fixtures, seal vents, and check gutters and downspouts for flow.
3
Pre-treatment
Biodegradable soft-wash detergent is applied at low pressure from the bottom up. Dwell time 10–20 minutes depending on organic growth severity.
4
Soft wash & spot treatment
Gentle low-pressure application covers every square foot. Heavy moss and lichen get hand-inspected and treated individually.
5
Rinse & gutter flush
Low-pressure rinse from the top down. Gutters and downspouts get flushed clean to handle the runoff without backup.
6
Walk-through & photo record
We do a full walk-through, document before/after, and flag any pre-existing issues (lifted shingles, flashing damage, etc.) for your awareness.
COMPLETE EXTERIOR CARE
Pair roof cleaning with a brighter exterior
Many estate and listing-prep projects combine roof care with exterior windows or gutter cleaning in one owner-reviewed estimate.
Honest pricing
What roof cleaning costs
Every quote is firm and written. These are our typical Bay Area ranges by roof size.
Small Home / Cottage
priced after review
Up to 1,500 sq ft of roof
- Full soft wash treatment
- Moss & algae removal
- Gutter flush included
- Before/after photo record
Standard Home
priced after review
1,500–3,000 sq ft of roof
- Full soft wash treatment
- Targeted moss & algae treatment
- Lichen spot treatment
- Gutter flush included
- Before/after photo record
Large / Estate
priced after review
3,000+ sq ft · complex roofs
- Full soft wash treatment
- All tile, slate, or shake detail work
- Lift or rigging when required
- Follow-up expectations documented in the written estimate
Secure estimate request · see our service area
Request your roof-cleaning estimate
Request a written estimate, send a photo if available, or see where we work across the Bay Area Peninsula.
Request Estimate
Free written estimate • No obligation. Free estimate, no obligation.
Open Secure Estimate RequestEstimate request only — no job or appointment is booked, and no payment is collected. Casey reviews your request and follows up during business hours.
Simple, owner-reviewed process
Tell us what needs attention and add photos if available.
- Choose roof cleaning in the secure estimate form
- Add roof type, city, and helpful photos
- Casey reviews the property details personally
- We confirm scope and arrange an on-site estimate when needed
Estimate request only · No payment collected
Serving the Bay Area
Based in San Mateo · 50-mile service radius.
Home baseSan Mateo, CA
Service radius50 miles
Follow-upDuring business hours
Available7 days a week
Questions we hear most
Roof pressure washing FAQ
Bay Area homeowners ask us these all the time. Straight answers.
Is roof pressure washing the same as roof soft washing?
No. High-pressure washing can damage shingles, tile details, flashing, and other roof components. Soft washing uses lower pressure and cleaning solutions selected for the roof material, condition, and type of buildup.
Will cleaning my roof void my warranty?
Warranty terms vary by manufacturer, roof material, age, and condition. High-pressure washing can conflict with published care guidance, so we select lower-pressure methods and recommend confirming any property-specific requirement with the manufacturer.
How often should I have my roof cleaned in the Bay Area?
Timing depends on roof material, shade, tree cover, coastal moisture, drainage, and the amount of visible buildup. We evaluate the current condition and recommend an appropriate cleaning plan for the property.
My insurance company flagged my roof — can you help?
We can address visible organic buildup and provide available before-and-after photos and service records. Share the written notice and deadline with your estimate request. The carrier alone decides whether the completed work satisfies its requirements.
How long does the cleaning last?
Longevity varies with roof material, shade, surrounding trees, moisture, and the severity of existing growth. Your written estimate explains the recommended method and realistic expectations for the property.
Is the detergent safe for pets, plants, and the environment?
We review access and property conditions, follow product-specific dilution and rinsing procedures, and protect landscaping around the work area. Please share plant, pet, drainage, or material concerns before service so they can be included in the plan.
Do you service commercial properties and HOAs?
Yes — apartment complexes, HOAs, office buildings, and commercial roofs. We carry local general liability and provide COI on request. See commercial services ›
What if my roof has lifted shingles or damage?
Full walk-through before we start. If we find lifted shingles, damaged flashing, or other issues, we document them and let you know before cleaning. Some damage needs repair first — we'll refer you to a trusted local roofer rather than making it worse.
Ready for a roof that looks cleaner and better cared for?
Free, firm estimates. Follow-up during business hours. Serving the Bay Area since 2017, with 165+ five-star reviews and documentation-focused roof cleaning.