The Most Important Rule: Do Not Use a Power Washer

Gentek’s written Fairhaven Sound care instructions state that this siding should never be cleaned with a power washer. This is a product-specific direction and should take priority over generic advice suggesting that all exterior siding can be pressure washed.

High-pressure water can be difficult to control around panel joints, trim, vents, windows and penetrations. It may also damage the surface or drive water into locations that were not intended to receive a concentrated spray.

Gentek Recommends Annual Cleaning

Gentek recommends cleaning Fairhaven Sound yearly to help prevent dirt and mildew buildup. According to its care guidance, ordinary garden-hose water will normally provide satisfactory cleaning.

Annual cleaning does not mean every elevation will need equal attention. A shaded wall near trees may collect organic residue more quickly than a sunny, open gable. Areas beneath gutters, roof edges and vents may also show localized streaking.

A brief yearly inspection lets the homeowner clean small areas before buildup becomes visually distracting.

A Conservative Cleaning Sequence

Start with the gentlest method identified by Gentek. Move to another method only when necessary and permitted by the current written care instructions.

1. Inspect the siding before cleaning. Look for loose panels, damaged trim, open penetrations, insect nests, staining beneath gutters and anything that may require repair rather than washing.
2. Protect the surrounding area. Close windows and doors. Move furniture, decorations and electrical items away from the wall. Follow appropriate precautions for plants and nearby finishes.
3. Test an inconspicuous area. Before treating a prominent gable or entry wall, confirm that the selected method does not alter the siding’s appearance.
4. Begin with an ordinary garden hose. Use normal household water pressure rather than a pressure washer or concentrated high-pressure nozzle.
5. Use a soft-bristle brush only when needed. Gentek indicates that gentle washing with a soft-bristle brush and water may be tried when hose cleaning is not satisfactory.
6. Rinse away loosened residue. Do not allow soil or an approved cleaning solution to dry on the surface.
7. Review the dry wall. Wet siding looks darker and can conceal remaining streaks. Evaluate the result after the wall has dried under normal conditions.

Why Shake Texture Needs Gentle Technique

Fairhaven Sound incorporates molded cedar-grain texture and varied shake patterns. That texture creates attractive highlights and shadows, but recessed areas may hold dust, pollen and organic residue longer than a smooth surface.

Scrubbing harder is not necessarily more effective. Aggressive brushes and abrasive pads can affect the surface appearance while still missing residue inside the molded pattern.

A soft brush, light pressure and patient rinsing are more consistent with Gentek’s published care direction.

Scallops Require Attention Beneath the Curves

Scallop siding has a repeated curved lower edge. Airborne dirt and cobwebs may collect beneath those projections, particularly in sheltered gables and near roof overhangs.

Clean the pattern patiently rather than forcing water upward beneath the panel edges. The objective is to rinse the exposed face, not test the wall’s resistance to concentrated water intrusion.

If access requires working at height, hire an insured professional who understands Gentek’s prohibition against power washing. A long-handled brush does not eliminate fall hazards or make an unstable ladder safe.

Cleaning Solutions Require Product-Specific Caution

PEPA’s general maintenance resources discuss mild soap and water for periodic cleaning of polymeric and vinyl siding. Gentek’s Fairhaven Sound instructions should still control the specific project.

Before applying a detergent, mildew remover or commercial exterior cleaner:

• Check the current Fairhaven Sound care and warranty instructions.
• Verify that the product is appropriate for polypropylene siding.
• Follow the cleaner manufacturer’s safety and dilution requirements.
• Test a small, inconspicuous location first.
• Protect adjacent metal, glass, masonry, roofing and landscaping.
• Do not mix cleaning chemicals unless their labels specifically permit it.
• Rinse the wall thoroughly as directed.

A stronger chemical is not automatically a better cleaner. If an ordinary hose and soft brush do not resolve the condition, identify the stain before escalating the treatment.

Dirt, Mildew and Algae Are Not the Same Problem

Dark or green discoloration may be described casually as mold, but appearance alone does not establish the cause. Organic growth may be occurring on surface dirt rather than consuming the polypropylene panel itself.

Recurring growth often deserves an environmental review. Contributing conditions may include:

• Persistent shade and limited drying
• Dense vegetation close to the wall
• Sprinklers repeatedly wetting the siding
• Overflowing or leaking gutters
• Roof runoff splashing against lower walls
• Poorly directed downspouts
• Dirt accumulation that supports organic growth

Cleaning the stain without addressing its moisture source may produce only a temporary improvement.

Some Marks Should Not Be Scrubbed

Not every visible change is surface dirt. Scrubbing will not repair a damaged panel, an installation distortion or a stain originating behind the siding.

Do Not Direct Water into Openings

Siding is part of a water-managed wall system. PEPA/VSI installation guidance calls for a continuous water-resistive barrier and properly integrated flashing behind polymeric siding.

Those concealed components manage incidental water; they do not justify deliberately forcing water behind the cladding. Use care around:

• Panel joints and lower edges
• Window and door trim
• Roof-to-wall intersections
• Electrical fixtures and outlets
• Vents, faucets and utility penetrations
• Loose or damaged accessories

Avoid These Cleaning Shortcuts

• Power washing: Gentek expressly says never to use a power washer on Fairhaven Sound siding.
• Stiff wire or abrasive brushes: These may alter the surface and cedar-grain appearance.
• Unverified solvents: A solvent may react with polymeric siding, nearby sealants or painted components.
• Undiluted concentrated cleaner: Stronger concentration can increase risk without addressing the actual stain.
• Mixing household chemicals: Some combinations can release dangerous gases or cause severe injury.
• Cleaning a dangerously high wall from a ladder: Hire an appropriately equipped and insured professional.
• Scrubbing a potential warranty condition: Document suspected product damage before changing its appearance.

A Simple Annual Exterior Review

Combine routine cleaning with a visual inspection of the entire exterior.

1. Walk around the home after winter and major storms.
2. Check gutters and downspouts before washing stained walls.
3. Look for loose panels, damaged corners and open penetrations.
4. Remove ordinary dirt using Gentek’s approved gentle method.
5. Trim vegetation to provide appropriate access and drying space.
6. Photograph conditions that may need professional evaluation.
7. Retain receipts for cleaning, repair and inspection work.

Maintenance Records Can Support Resale

Routine cleaning does not guarantee a higher resale value. A clean, documented exterior can help the home present well and show prospective buyers that maintenance has not been ignored.

Keep the current care instructions, written warranty, invoices, product color and repair records together. If the warranty contains transfer provisions, review the required process rather than assuming coverage transfers automatically.

Documentation is especially useful when a buyer or inspector asks whether a stain was cleaned, repaired or evaluated by a professional.