If you’ve just installed composite decking in your garden, restaurant, or office patio area, then you’re probably wondering how you can keep it looking brand new for as long as possible.

You’ll be happy to know that composite decking doesn’t take much in the maintenance department; it’s more durable and longer-lasting than timber.

However, you do need to make sure you’re using the right products, keeping on top of repairs, and following a thorough cleaning routine every six months. Luckily for you, we’ve compiled the perfect guide to do so.

How often should you clean composite decking?

Unless you want to face stubborn algae build-up, unsightly stains, and discolouration, it’s important to establish a regular cleaning routine.

However, when we say 'regular', we really mean a light clean every two weeks in the spring and summer months. Of course, you’ll have to make some exceptions for storms that have blown debris onto your decking or a spill that needs immediate attention.

Since composite decking is low-maintenance, you can limit deep cleans to every 6 to 12 months.

If you own a business, you’re likely to have much more foot traffic, causing more wear and tear. Restaurants, cafes, offices, and other establishments may need to deep clean their composite decking every 3 to 6 months to stay on top of it.

Cleaning tools & materials you’ll need

Before we get started, gather the following:

A soft-bristled brush
A low-pressure hose or pressure washer
PH-neutral decking cleaner or mild soap
Microfibre cloth or soft sponge
Washing bucket
Algae and moss treatment (optional)

It’s always best to clean your composite decking on a warm, dry day, as the boards will dry quicker. Avoid a windy day if you can to prevent debris from sticking to your deck area.

A step-by-step guide: cleaning composite decking

Once you’ve gathered all the products you need, it’s really quite straightforward from there.

1. Clear the decking

Before you get started, you’ll need to remove any garden furniture, tables, or decor from your decking area.

This will give you an obstructed deck, allowing you to clean areas that often go neglected (e.g., the floor underneath patio couches that has been collecting dust).

It also means nothing will get damaged during the process. Use this time to search for broken boards that need repairing or scratches that need addressing.

2. Sweep away debris

Using a soft-bristled brush, clear away any dirt, fallen twigs, leaves, or rubbish that’s blown over.

Doing so will help you avoid any scratches when scrubbing your deck, so make sure to get between the small gaps on the boards. Using a small handheld vacuum cleaner is a great hack for getting into those small crevices.

3. Pre-rinse the decking

Before applying the cleaning solution, pre-soak your composite decking to wash away any loose grime, dust, or pollen.

Once wet, the cleaning solution will absorb more effectively, making the entire process easier. To do this, you can use a small garden hose fitted with a spray nozzle or a pressure washer on a low setting. We recommend a maximum pressure of 1,500 PSI.

Hold the nozzle at least 12 inches (approximately 30 cm) above the surface and use a fan nozzle with a wide spray pattern for safer distribution. Do not pressure wash uncapped boards, as this can damage the top layer of your decking.

4. Apply cleaning solution

Prepare your pH-neutral decking cleaner according to the manufacturer’s instructions — typically, this involves diluting it with water in a bucket.

Or, you can use a mild soap for a basic clean. Apply the cleaning solution generously across your decking boards, working in sections. Scrub in the solution in circular motions before it dries to avoid streaks or residue.

Avoid a cleaner that’s too strong or solvent-based.

5. Scrub gently

When scrubbing, use a soft-bristled brush, soft sponge, or microfibre cloth to avoid damaging the boards.

You can use a small brush, such as a toothbrush, to access hard-to-reach areas, like the ridges on your boards. Apply gentle, consistent pressure to lift any dirt, algae or stains, focusing more on boards that are stained or ruined from bird droppings.

6. Rinse and dry

Once you’ve finished scrubbing your boards, rinse the composite decking again with your hose or pressure washer.

Make sure that all traces of soapy residue are removed to avoid streaks— this is especially important for commercial properties that want to maintain a clean and professional appearance.

Leave your decking to air-dry fully for a couple of hours before replacing any furniture or walking over it.

Common composite decking stains and how to tackle them

Stain type	Cause	How to clean
Food and drink	Sauces, wines, BBQ spills, soft drinks, tea and coffee	pH-neutral decking cleaner diluted as per instructions
Algae and mould	Damp, shaded areas with poor airflow	Apply algae and moss control treatment, suitable for composite
Grease and oil	BBQ fat, cooking oils, dripping meat	Absorb with a kitchen towel, then use a degreaser suitable for composite boards
Rust	Metal furniture, tools or fixings left exposed	Use a rust remover and add protective pads to metal furniture
Bird droppings	Wildlife mess on an uncovered decking area	Soak with warm water, use a soft bristle brush and mild detergent
Water spots	Natural leaching from organic debris (leaves, seeds, flowers)	Use a pH-neutral decking cleaner and rinse consistently to remove debris

Upgrade your patio with Beesley and Fildes composite decking

If you’re looking to upgrade your patio area in time for the summer, then look no further.

At Beesley and Fildes, we have a great range of composite decking boards for home and business owners. With a selection of stunning boards to browse, including weathered oak and burnished oak composite, we’ve got something to uplift any space.

By following our cleaning tips, your composite decking will look and feel great for years to come!

FAQ’s

Can you use a vinegar solution for composite decking boards?

Yes, a diluted white vinegar solution (usually mixed 1:10 with water) can help remove mild mould or mildew, but it’s not as effective as composite decking cleaner.

It is a good option in the meantime, though, if you’ve run out of cleaner or need a quick fix! However, don’t use it all the time and apply sparingly, as too much acidity can damage the boards.

How can I protect my composite decking from damage?

Here are some great tips to keep your composite decking looking great for longer:

Use protective furniture pads
Place down outdoor rugs and mats
Avoid dragging heavy items across the deck
Avoid harsh cleaners
Always keep gutters and drains clean
Ensure proper drainage underneath the deck

Can you use bleach on composite decking?

No, avoid using bleach on your composite boards at all costs.

Bleach is too harsh for composite, as it can strip the colour, damage the top layer, and reduce the lifespan of your boards.

Is patio cleaner safe for composite decking?

This depends on the individual cleaner.

A lot of standard patio cleaners are made for concrete, paving slabs, or stone, not composite. Some might include chemicals or acids that weaken or discolour composite boards, so always carefully read the product label.