A.

Algae — A common green or black organic growth that forms on siding in humid, coastal climates like Kiawah Island. Regular soft washing effectively removes algae and prevents long-term staining.

Aluminum Siding — A lightweight, rust-resistant metal siding option that can accumulate oxidation, chalking, and mildew over time. Pressure washing restores its appearance without causing dents or damage when done correctly.

B.

Biological Growth — A broad term for any living organism growing on a surface, including algae, mold, mildew, moss, and lichen. Professional exterior cleaning removes biological growth before it causes lasting damage to your siding.

Board and Batten Siding — A style of siding featuring wide vertical boards alternating with narrow strips called battens. The grooves and seams can trap dirt and moisture, making periodic cleaning especially important.

C.

Cedar Siding — A natural wood siding known for its beauty and durability. Cedar requires gentle cleaning methods — soft washing is recommended over high-pressure washing to avoid raising the grain or stripping protective finishes.

Chalking — A powdery residue that forms on the surface of older painted or aluminum siding as the paint breaks down over time. Professional cleaning can remove chalking and restore the look of the surface.

Composite Siding — A siding material made from a blend of wood fiber and resin, designed to mimic the look of natural wood while offering greater durability. Soft washing is the safest cleaning method for composite siding.

Coquina — A natural shell-based material historically used in Lowcountry construction. Requires careful, low-pressure cleaning to preserve its unique texture and integrity.

D.

Dirt Accumulation — The gradual buildup of dust, soil, and environmental debris on siding surfaces. Left untreated, dirt accumulation can trap moisture against the siding and accelerate deterioration.

Dryvit — A brand name for EIFS (Exterior Insulation and Finish System), a synthetic stucco-like siding. Dryvit is sensitive to high-pressure water and should always be cleaned using a soft wash approach.

E.

EIFS (Exterior Insulation and Finish System) — A multi-layer exterior cladding system that provides insulation and a decorative finish. Because it can be easily damaged by high pressure, soft washing is the only recommended cleaning method.

Efflorescence — A white, chalky residue that appears on masonry and stucco surfaces when water carries salts to the exterior. It can be removed with professional cleaning using the appropriate solutions.

Engineered Wood Siding — A manufactured siding product made from wood strands or fibers bonded with resin. It offers the look of real wood but requires careful soft washing to prevent water intrusion and swelling.

F.

Fascia — The horizontal board running along the roofline that covers the ends of the roof rafters. Fascia boards are prone to mold and mildew buildup and are often cleaned as part of a full exterior or gutter cleaning service.

Fiber Cement Siding — A highly durable siding material made from cement, sand, and cellulose fibers. Brands like HardiePlank are common in the Lowcountry. Fiber cement can be safely cleaned with soft washing or low-pressure rinsing.

H.

HardiePlank — A popular brand of fiber cement lap siding widely used in coastal communities for its resistance to moisture, rot, and insects. Soft washing is the preferred method to keep HardiePlank looking fresh without voiding manufacturer warranties.

Hard Water Stains — Mineral deposits left on siding from sprinkler systems or hard water runoff. These stains appear as white or cloudy spots and require specialized cleaning solutions to fully remove.

L.

Lap Siding — Horizontal boards that overlap one another, also known as clapboard siding. The overlapping joints can collect dirt, mold, and moisture over time and benefit greatly from regular professional cleaning.

Lichen — A stubborn combination of algae and fungi that bonds tightly to siding and roof surfaces. Lichen is more difficult to remove than standard algae or mildew and typically requires professional-grade soft wash treatments.

M.

Masonry — A category of building material that includes brick, stone, concrete block, and stucco. Masonry surfaces are durable but porous, making them susceptible to algae, efflorescence, and staining that professional cleaning can address.

Mildew — A surface fungus that appears as flat, powdery patches — often gray or white — on siding, decks, and other exterior surfaces. Mildew thrives in the humid Lowcountry climate and is effectively treated with soft washing solutions.

Mold — A fungal growth that penetrates deeper into surfaces than mildew and can cause structural damage if left untreated. Professional exterior cleaning removes visible mold and helps prevent regrowth.

Moss — A green, carpet-like growth that attaches to siding, roofs, and hardscape surfaces in shaded or moist areas. Moss retains moisture against surfaces and should be removed promptly to prevent deterioration.

O.

Oxidation — The breakdown of a surface’s paint or finish caused by prolonged exposure to oxygen, UV rays, and moisture. Oxidation leaves a chalky, faded appearance on aluminum and painted siding that professional cleaning can help restore.

P.

Paint Peeling — A sign that moisture has penetrated behind the siding or that the surface has not been properly maintained. While cleaning cannot reverse peeling, removing biological growth and dirt helps prevent the conditions that lead to it.

Pressure Washing — A cleaning method that uses high-pressure water to remove dirt, grime, and buildup from hard, durable surfaces. Appropriate for concrete, brick, and certain types of siding — but not recommended for all surfaces.

S.

Salt Deposits — A common issue in coastal areas like Kiawah Island, where ocean air carries salt particles that settle on siding and exterior surfaces. Salt buildup accelerates corrosion and deterioration and should be rinsed and cleaned regularly.

Soffit — The underside of a roof overhang, typically made from vinyl, aluminum, or wood. Soffits collect dust, cobwebs, mold, and insect nests and are often cleaned as part of a comprehensive exterior cleaning service.

Soft Washing — A low-pressure cleaning method that combines gentle water pressure with biodegradable cleaning solutions to safely remove organic growth, stains, and buildup from delicate surfaces. Recommended for roofs, painted wood, stucco, and EIFS.

Stucco — A textured plaster-like exterior finish applied over masonry or wood framing. Stucco is porous and prone to algae and mildew growth. Soft washing is the safest method for cleaning stucco without causing cracking or erosion.

T.

Tannin Staining — Dark staining caused by the natural oils in wood, often seen on cedar or redwood siding. Tannin stains can bleed onto adjacent surfaces and require specific cleaning solutions to treat effectively.

T1-11 Siding — A plywood or OSB panel siding with vertical grooves, commonly used on outbuildings, older homes, and budget construction. It is prone to moisture retention and biological growth and benefits from regular soft washing.

V.

Vinyl Siding — One of the most common siding materials in residential construction. Vinyl is low-maintenance but prone to algae, mold, and dirt buildup over time. It cleans up beautifully with soft washing or gentle pressure washing.

W.

Weather Staining — Discoloration caused by prolonged exposure to rain, sun, wind, and humidity. Weather staining is especially common on wood and fiber cement siding in the Lowcountry and can often be significantly improved with professional cleaning.

Wood Siding — A traditional siding material that includes cedar, pine, and redwood options. Wood siding requires the most careful cleaning approach — soft washing at low pressure preserves the wood’s integrity and avoids moisture intrusion.