How to clean composite decking boards: A practical step-by-step guide.
Find out how to clean composite decking boards effectively. Tried-and-tested methods, home remedies and tips to help your composite decking look as good as new!
Composite decking boards have become hugely popular in Poland – and it is easy to see why. They are durable, weather-resistant and look almost like natural wood. However, like anything outdoors, they can become dirty, dull or even covered in moss over time.
In this guide, we’ll show you how to clean a composite decking board so that it serves you for many years. We’ll cover cleaning by hand and using a pressure washer, as well as home remedies and specialist products. We’ll also explain what to avoid so you don’t damage the board’s surface.
Why is it worth regularly cleaning a composite decking board?
Even if your composite decking boards look clean, tiny particles of dust, pollen and grease gradually settle on them, and even mould or moss can develop. In winter, road salt is another problem, while in autumn leaves leave unsightly marks.
Regular cleaning of a composite decking board means:
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a longer material lifespan,
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an attractive-looking patio all year round,
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a lower risk of slipping (e.g. on moss deposits),
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no need for costly repairs or board replacement.
How often should you clean a composite decking board?
It depends on where your patio or balcony is. For a detached house in the countryside, perhaps once every 2–3 months. In a city, where dust and exhaust fumes settle more quickly, even once a month. The minimum? 2 times a year: in spring and autumn.
What should you NOT do when cleaning composite decking boards?
- Do not use chlorine bleach – it may discolour the board.
- Do not scrub with a hard steel brush – you will damage the protective layer.
- Do not leave cleaning products on for longer than necessary – they may soak in and leave stains.
- Do not pour boiling water over it – a sudden change in temperature may deform the board.
How to clean a composite decking board – methods step by step.
1. Cleaning by hand – for everyday care.
What will you need?
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a soft brush with long bristles,
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a bucket of warm water,
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a mild detergent (e.g. washing-up liquid),
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a mop or sponge.
How do you do it?
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Sweep the patio – remove leaves, sand and larger pieces of dirt.
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Prepare a solution of water and a few drops of detergent in a bucket.
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Scrub the board along the grooves – that is where most of the dirt collects.
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Rinse with clean water.
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Leave it to dry – preferably on a sunny day.
👉 This method works well for everyday dirt, such as dust, mud or shoe marks.
2. Pressure washer – quick and effective.
Warning! Not every composite decking board is suited to being cleaned with a pressure washer. Before you start, check the manufacturer's instructions to see whether your model can withstand the pressure.
How to use a pressure washer safely?
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Maximum pressure: up to 100 bar.
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Keep the nozzle at least 30 cm away from the decking board.
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Do not use the pinpoint spray setting – it may damage the surface.
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Always direct the spray along the decking board, not across it.
Advantages of this method:
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quick removal of mud, moss and dried-on dirt,
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ideal for spring cleaning.
3. Home remedies for stubborn stains.
Got a greasy stain from a grilled sausage? Or has your child spilt juice? Instead of panicking, try these tips:
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Vinegar and bicarbonate of soda – great for organic stains (e.g. from leaves). Sprinkle with bicarbonate of soda, pour over vinegar, leave for a few minutes and scrub with a brush.
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Bicarbonate of soda and water paste – ideal for greasy stains. Apply the paste, leave for 15 min, then rinse.
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Marseille soap and water – gentle but effective. Great for more frequent cleaning.
4. Ready-made cleaners for composite decking boards.
Specialist products designed for composite decking are available on the market. Tried-and-tested brands include:
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Osmo – a product for caring for WPC and BPC,
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HG – a cleaner for decking boards,
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Owatrol – a range of products for composite decking boards.
How to use:
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Always read the instructions on the packaging.
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Dilute as directed.
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Apply, leave for a few minutes, scrub with a brush and rinse with water.
Cleaning composite decking in winter.
In winter, it's best... not to do too much. Simply:
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clear the snow regularly with a plastic shovel (not a metal one!),
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do not spread salt or sand,
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brush it with a dry brush from time to time to remove snow and moisture.
👉 Remember that most manufacturers advise against intensive cleaning in winter – wait until spring!
Bonus: Quick cleaning checklist.
✅ Sweep the surface
✅ Wash with water and a mild detergent
✅ Rinse with clean water
✅ Leave to dry
✅ Use a pressure washer only for heavier dirt
✅ Clean 2–4 times a year
Frequently asked questions. (FAQ)
Do composite decking boards need oiling?
No. Composite decking boards do not need oiling, which is a major advantage compared with wood.
Can you clean a composite decking board with a Karcher?
Yes, but use the appropriate pressure (up to 100 bar) and do not use the rotary setting. Always read the manufacturer's recommendations!
How do you remove moss from a composite decking board?
A pressure washer or an anti-fungal treatment is best. You can also use water and vinegar.
How do you care for composite decking in winter?
Clear snow with a plastic shovel, do not use salt and avoid aggressive chemicals.
In summary.
Caring for composite decking boards need not be a chore. Just follow a few simple rules and clean regularly, and your decking will look as good as new for many years. Avoid aggressive products, follow the manufacturer's recommendations and... enjoy summer on a clean, beautiful deck!
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