Green Algae
Common on shaded siding, masonry, retaining walls, pavers and exterior surfaces that stay damp longer.
Serving Greater Montreal
Pressure Washing
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Exterior Soft Washing · Montreal & Laval
Algae & Mold Removalin Montreal & Laval
Surface-safe exterior cleaning for algae, mildew, green growth, dark organic staining and visible mold-like buildup on siding, brick, stucco, masonry, concrete, pavers and compatible exterior surfaces.
Montreal · Laval · Rive-Nord · Rive-Sud
Soft-Wash Treatment
ORGANIC GROWTH · SURFACE-SAFE CLEANING
ORGANIC GROWTH
TREATED SURFACE
MethodLow-Pressure Soft Wash
TargetAlgae · Mildew · Growth
FinishControlled Final Rinse
Low-Pressure CleaningFor siding, facades & delicate finishes
Biodegradable DetergentsCleaning chemistry matched to surface
Landscape AwarenessPre-wet, rinse & protect sensitive areas
Residential + CommercialHomes, condos, storefronts & buildings
Exterior Organic Growth Removal
Green, black and streaked surfaces are not all the same.
Exterior growth can appear as green films, dark streaks, mildew spotting or heavier organic buildup. The cleaning method depends on the surface underneath—not simply how dirty it looks.
Mildew & Dark Staining
Spotting and discoloration that can build up on siding, soffits, stucco and painted exterior surfaces.
Moss & Organic Buildup
Growth in shaded joints, pavers, walls and select roof surfaces where moisture and debris accumulate.
Recurring Growth
Areas with shade, moisture and limited airflow can develop organic staining again over time.
Surfaces We Soft Wash
The surface determines the pressure.
Soft washing is especially useful when high pressure could damage the finish, force water behind siding or unnecessarily erode joints and coatings.
Vinyl & Aluminum Siding
Low-pressure cleaning for green growth, mildew, dust, soot and organic staining.
Stucco & Painted Surfaces
Controlled cleaning that avoids aggressive blasting on coatings and textured finishes.
Brick & Stone
Surface-aware treatment for organic growth while respecting mortar and porous materials.
Concrete & Pavers
Algae and organic buildup on walkways, patios, retaining walls and shaded paved areas.
Soffits, Fascia & Gutters
Exterior cleaning for visible staining and growth around roofline components.
Roof Soft-Wash
Low-pressure treatment for compatible roofing surfaces where organic staining is present.
Soft Washing vs. High PressureGet a Soft-Wash Quote →
Organic growth often needs treatment—not brute force.
Blasting algae from delicate siding can remove what is visible while using more pressure than the surface needs. A soft-wash process relies on appropriate cleaning solution, dwell time and a controlled rinse to release organic buildup.
01
Pre-wet & protectPrepare landscaping, windows and sensitive areas before applying cleaning solution.
02
Apply the treatmentUse surface-appropriate cleaning chemistry at low pressure.
03
Allow controlled dwell timeGive the treatment time to work on organic staining and buildup.
04
Rinse at the right pressureRemove loosened residue without unnecessarily blasting the surface.
Choose the Method by Surface
Soft Washing
Best suited to more delicate exterior surfaces and organic staining where chemistry can do more of the work.
- Siding & stucco
- Painted finishes
- Soffits & fascia
- Select roof surfaces
Controlled Pressure
Useful on durable hard surfaces when the substrate and joints can safely handle a more mechanical cleaning approach.
- Concrete
- Stone
- Some brick & masonry
- Pavers & hardscape
The point: “pressure washing” is not one pressure setting.
The cleaning method should change with the surface, growth and condition of the property.
Why Algae Comes BackAsk About the Property →
Shade + moisture + time.
Organic exterior growth tends to return first where surfaces stay damp, receive little direct sun or sit near vegetation. Cleaning removes the buildup, but the conditions around the property still matter.
North-facing or heavily shaded walls
Trees and dense vegetation close to the building
Poor airflow and surfaces that dry slowly
Roof drainage, splashback and repeated moisture
Common Growth Conditions
SHADE
VEGETATION
SLOW DRYING
MOISTURE
Before & After Exterior Cleaning
Use only your strongest real algae-removal photos.
This page is designed to need only one or two strong photos. Replace these optional panels with real siding, facade, masonry or hardscape transformations when available.
Optional: replace ALGAE_IMAGE_1_URL with a real siding or facade before/after.
Our Soft-Wash Process
Protect the surroundings. Treat the growth. Rinse clean.
Good soft washing is controlled from preparation through final rinse. We adjust the process around the surface, landscaping, access and severity of the organic buildup.
Inspect & prepare
Identify surface type, organic growth, windows, landscaping and areas needing extra protection.
Pre-wet & treat
Prepare sensitive areas and apply the appropriate soft-wash treatment at low pressure.
Dwell & rinse
Allow the treatment to work, then rinse the surface using controlled pressure.
Final check
Inspect the finish, rinse surrounding areas and address remaining spots where appropriate.
Residential & Commercial Soft Washing
Organic growth affects every type of property.
From shaded home siding to condo walls and commercial facades, the goal is the same: remove visible organic buildup while using a method appropriate for the material underneath.
Homes & Duplexes
Condos & Multi-Unit
Storefronts & Plazas
Offices & Institutions
Property Managers
Commercial Buildings
Send the surface, the location and what you see.
01
What surface is affected?
Siding, stucco, brick, concrete, pavers, roofline or another exterior finish.
02
Where is the growth?
One shaded wall, the entire facade, walkways, roofline or multiple areas.
03
Send close and wide photos
Close-ups show the staining; wider photos show access, height and overall scope.
04
We recommend the cleaning method
Soft wash, controlled pressure or a combination depending on the surfaces involved.
Service Scope
This is exterior surface cleaning—not indoor mold remediation.
Montreal Prestige Wash removes exterior algae, mildew, organic staining and visible mold-like growth from compatible outdoor surfaces. Indoor mold, concealed moisture problems, contaminated building materials and building-envelope remediation require a qualified mold-remediation or building specialist.
Algae & Mold Removal Service Area
Montreal, Laval & Greater Montreal.
Exterior soft washing and organic-growth removal for residential and commercial properties throughout Montreal, Laval and surrounding communities.
Related Exterior Cleaning Services
One growth problem can reveal a larger cleaning need.
If algae or mildew is only one part of the property’s exterior condition, these related services can cover the rest of the surfaces.
Algae & Mold Removal FAQ
Questions about exterior soft washing.
Soft washing uses lower pressure and relies more on appropriate cleaning chemistry and dwell time.
This makes it a better fit for many siding, stucco, painted and other more delicate exterior surfaces where aggressive pressure may cause damage or water intrusion.
Yes. Green algae and organic staining on vinyl siding are common soft-wash applications.
The surface is treated at low pressure and then rinsed in a controlled manner.
Exterior mildew and organic staining can often be treated on brick, masonry and stucco.
The cleaning solution and pressure are adjusted to the material and its condition.
It can. Shade, moisture, nearby vegetation, limited airflow and surfaces that dry slowly can allow organic growth to return over time.
Cleaning removes the current buildup but does not change every environmental condition around the property.
We use biodegradable detergents and a controlled workflow. Sensitive vegetation and surrounding areas can be pre-wet, protected and rinsed as part of the cleaning process.
No. This service is for exterior surface cleaning. Indoor mold, concealed moisture problems and contaminated building materials should be handled by a qualified mold-remediation or building specialist.
Send the property address, surface type, affected areas and a few photos.
One close-up of the growth and one wider photo showing access and height are especially useful.
Algae & Mold Removal Quote
Show us the growth and the surface.
A few clear photos can usually tell us a lot about the surface, access and severity of the organic buildup.
Property address or postal code
Siding, brick, stucco, concrete, pavers or roofline
Green algae, mildew, dark staining or moss
One close-up photo of the buildup
One wider photo showing height and access
Residential or commercial property