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SENYU wood-plastic composite decking is engineered to stay beautiful for decades with minimal upkeep. Here is everything you need to know about keeping your deck in top condition — from fixing color variation to removing stains, mildew and rust marks.
One of the biggest advantages of WPC (Wood-Plastic Composite) decking over traditional timber is that it never needs sanding, staining, painting or sealing. There is no rot to worry about and no annual repainting cycle.
That said, "low maintenance" is not the same as "no maintenance". A simple routine — occasional cleaning with soapy water, keeping drainage gaps clear, and dealing with spills promptly — will keep your SENYU deck looking like new for 20–25 years or more.
This guide covers the six most common issues deck owners encounter, what causes them, and exactly how to solve each one.
Most composite decking problems are easy to solve once you know the cause. Find your issue below — each card shows the typical cause on the left and the recommended solution on the right.
This is to be expected prior to natural weathering. Freshly installed boards have not yet been evenly exposed to sunlight and rain, so slight shade differences between boards are normal.
Nothing to do — simply wait. Once the material has been exposed to the elements for a few months, the color will even out naturally across the entire deck surface.
Darker areas have been exposed to less weathering — typically under furniture, planters or in permanently shaded spots where rain and sun never reach the surface evenly.
Wet the darker areas with water to accelerate the weathering effect. If an area suffers from constant shade, use a proprietary deck cleaner (treat it as a heavily soiled area) to speed up the process.
An uneven support structure, inadequate gapping, poor ventilation, or debris clogging the gaps between boards — all of which block water drainage and airflow.
Drainage slots may need to be cut into inadequately spaced boards. Install adequate ventilation gaps during installation. For clogged gaps, use a flat tool to remove the debris regularly.
Oil stains from barbecues, cooking splashes, salad oil, sunscreen and dropped food. The longer they sit, the more they set into the surface.
Remove oil and grease stains with a household or automotive degreasing product as soon as possible, then rinse thoroughly with clean water. Speed is the key.
Mildew can appear in poorly drained or heavily shaded areas, and underneath deck furniture or planters where moisture lingers on the surface.
Clean affected areas with a dedicated mould & mildew cleaner, then rinse. Improve drainage and airflow around the deck, and move furniture occasionally to let surfaces dry out.
Low-quality fasteners, or ferrous objects such as steel garden furniture, metal plant pots and tools left standing on the deck, leaving rust transfer marks.
Use a soft brush or sponge on the marks with soapy water. Replace low-quality fasteners with high-quality stainless steel or coated screws, and avoid leaving ferrous metal objects on the deck.
These are actual SENYU WPC installations — balconies, pool surrounds, terraces, gardens, parks and commercial plazas. Every one of them is maintained with nothing more than soap, water and a soft brush.
Want to see more finishes and cross-sections? Browse the composite decking range or request a free sample.
Prevention is far easier than repair. Build these three simple habits into your seasonal routine and most issues above will never appear.
Sweep off leaves and dirt, then wash with warm water and mild soap 2–4 times a year. Rinse thoroughly. Regular washing prevents mildew and keeps the surface even in color.
Check the drainage and expansion gaps between boards each spring and autumn. Remove trapped leaves, twigs and debris with a flat tool so water drains and air circulates freely.
Clean up BBQ grease, oil, wine and food spills as soon as they happen. Fresh stains wipe away in seconds; set-in stains may need a degreaser and more scrubbing.
Print this out, stick it in the garden shed — these simple rules cover 95% of what your deck will ever need.
The questions our customers ask most about WPC decking care. For installation questions, see our installation instructions.
SENYU manufactures premium WPC decking, siding and fencing, exported to 65+ countries. Our technical team offers free support from shipment to installation — 7×24h online.
