Composite decking maintenance: low maintenance is not maintenance-free

Why outdoor surfaces get dirty #

Even a closed room collects dust. An outdoor deck also receives pollen, leaves, airborne grit, bird droppings and residues from shoes and furniture. Deposits on top of a board do not automatically mean the material is defective. They still need removing before they become ingrained or hold moisture.

A repeatable cleaning sequence #

Move furniture without dragging it. Sweep with a soft broom and remove accessible debris from designed drainage gaps without sharp tools. On a cool surface, work in manageable sections with an approved mild cleaner. Gently brush along the texture, rinse before the cleaner dries and inspect after drying.

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How often should you clean? #

Use spring and autumn as planning checkpoints, not universal warranty intervals. Shaded, tree-covered, coastal or busy areas may need more frequent attention. Clean spills promptly and remove leaf piles as they accumulate. Keep a short log of dates, products and persistent marks to make repeat problems easier to investigate.

Pressure washers and common mistakes #

A pressure washer is optional only when the exact product guide permits it. Obtain the permitted pressure, nozzle and stand-off distance; a machine's low setting is not a universal specification. Avoid concentrated jets, steam, wire brushes and unapproved coatings. Stop if the surface changes texture or colour during cleaning.

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Product instructions come first #

Identify the manufacturer, collection, capped or uncapped surface and installation date before choosing a treatment. A method suitable for one composite can damage another. Start with loose-dirt removal, then a small test using the permitted cleaner and a soft non-metal brush. Rinse thoroughly and assess when completely dry. Follow the product's dilution, contact time and care instructions; never mix cleaning chemicals. Restrict access while the surface is wet or unsafe.

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Green Plank product support #

For Green Plank decking, fencing or cladding, request the current care instructions for your exact profile and finish. The Green Plank links below are commercial documentation resources. These guides provide general care advice, not a product certification or a decision on any individual warranty claim.

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Practical inspection checklist

Common questions