Best Composite Deck Cleaner

Best Composite Deck Cleaner – How to Clean Composite Decking

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Composite decking is the ideal flooring for your outdoor deck space. However, it can be ruined if not cared for and maintained properly. Composite decking must be cleaned regularly with the right deck cleaners to ensure that it remains in impeccable condition.



What Are Composite Decks?

Composite decks are environmentally friendly as they are made of recycled wood and plastic. They are natural-looking and come in a variety of earthy colors that will suit your outdoor décor perfectly. You can build your own composite deck yourself as they can be assembled as planks or as deck tiles. They are simple to assemble and snap in place easily.


Why Choose a Composite Deck?

  • It requires less maintenance than the traditional wooden deck. 
  • It is environmentally friendly. 
  • It can withstand the elements. 
  • It lasts a long time. 
  • It is not susceptible to rotting. 

How to Clean Composite Decking



Best Composite Deck Cleaners

Cleaning composite decking is an easy task, but you do need to use specific composite deck cleaners and composite deck brighteners to ensure that your deck is protected from staining. This will also ensure that the color continues to look rich and vibrant.

The best composite deck cleaners (available in a ready-to-use mix or liquid) will leave a protective film on the surface of the deck to help make it resistant to rot. You can apply the deck cleaner to the surface by simply spraying it on, brushing the excess residue off, and then rinsing it off with a hosepipe. We have selected the leading products for cleaning your composite deck.


Eco-Friendly: SIMPLE GREEN Pro HD Heavy Cleaner

This water-based deck cleaner is environmentally friendly as it is biodegradable. It can be used on a variety of surfaces and is easy to clean. This product creates the perfect balance between heavy-duty yet gentle cleaning, as it can be used on heavy machinery as well as everyday household items.

SIMPLE GREEN Pro HD Heavy Duty Cleaner
  • Biodegradable with no harsh chemicals
  • Quickly eliminates tough grease, grime, and stains
  • Odorless
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You can dilute the concentrate depending on what needs to be cleaned, after which you can use it in a pressure washer and other types of cleaning equipment. As this cost-effective cleaner has a water base, it is much safer to use than other harsh cleaning products made with toxic chemicals.


  • No odor
  • Environmentally friendly
  • Contains no harsh chemicals


  • Not as strong as other chemical cleaners


Best Value: MOLD ARMOR E-Z Wood and Composite Deck Cleaner

You can clean and brighten your deck within a matter of minutes by using this composite deck cleaner. Using a bleach-based formula, this cleaner will remove all evidence of stains, mold, and mildew. This cleaner is ideal for restoring the natural look of old, faded wood, and can be used as a means of preparing a deck surface before painting it.

MOLD ARMOR E-Z Deck, Fence and Patio Wash
  • Designed with a hose-end adapter for easy application
  • A powerful cleaning solution for use on most surfaces
  • Restores the natural look of weathered, discolored wood
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This product is particularly easy to use due to its garden hose attachment – you simply need to attach the hose to the valve while it is in the OFF position. You will the spray the affected surfaces and wait for a period of 10 minutes, after which you can wash it off without needing to scrub the surface!


  • Has a hose adaptor for easy application and cleaning
  • No scrubbing required
  • Kills mold and mildew whilst cleaning and brightening your deck


  • Formulated with harmful chemicals


Premium Choice: OLYMPIC STAIN Deck Brightener and Wash

This deck cleaner is formulated so as to brighten your deck while washing it. This product removes mold and mildew and can be used on both bare and coating wood as well as composite decks and surfaces. Use this deck brightener and wash to restore the vitality of your weathered, discolored surfaces. Woods like Redwood and Cedar will not be darkened by using this product.

OLYMPIC STAIN Premium Deck Brightener & Wash
  • Gently washes away dirt from pre-stained surfaces
  • Excellent for rust and tannin stains
  • Ready to use - no mixing required
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This product is easy to use due to its pre-mixed formula, and will be particularly effective on stains caused by rust and tannins. You can expect to cover approximately 200 square feet per gallon, although this will depend on the condition of the wooden surface.


  • Gentle cleaner for all types of wood
  • Can be used on bare and previously stained surfaces
  • Ready-to-use mixture


  • Scrubbing or pressure wash may be required



What are the Best Sealers for your Composite Deck?

After cleaning your composite deck, you will want to protect it from further mold, mildew, and discoloration. You can lengthen the life of your composite deck by applying a good quality sealer over the surface. Applying a sealer will protect your deck’s surface from the elements and will provide a glossy finish that enhances the color of the wooden surface.

Composite Deck Brightener


DEFY Crystal Clear Composite Deck Sealer

This water-based deck sealer is formulated with special technology that allows it to resist the harmful effect’s of the sun’s UV rays. Sealing your deck with this product will result in a long-lasting, durable surface that will resist weather, abrasions, and discoloration.

DEFY Crystal-Clear Composite Deck Waterproofing Sealer
  • A water-based, clear composite wood and deck sealer
  • Strengthened with zinc nano-particle technology for UV protection
  • Extremely durable, high-quality, long-lasting, and easy to maintain
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You can apply Defy’s crystal-clear sealer to your composite deck by spraying an even layer over the surface, and then leave it to dry for 24 to 48 hours. This sealant is also biodegradable. As with most sealants, you must ensure that an even layer is applied to the surface area to avoid puddle build-up, as this will ruin the clean, glossy effect you are after.


  • Water-based
  • No odor
  • Environmentally friendly
  • Easy application


  • Expensive



What to Consider When Choosing a Composite Deck Cleaner

There are a number of things to consider before you choose a cleaner for your composite deck:

  • Toxicity – Some deck cleaners contain harsh chemicals that can ruin the unique look of your composite deck. You must always ensure that you wear suitable protective gear.
  • Versatility – It can clean many surfaces such as outdoor furniture, fencing, concrete, and so on, thus saving you time and money.
  • Usability – Some deck cleaners come with a long list of tips on how to apply the cleaner to the deck. The deck cleaners we have recommended above can clean your composite deck quickly and easily, as they are simple to apply.
  • Safety – Check the label before you purchase a deck cleaner to ensure that it is both pet- and family-friendly.
  • Price – Expensive products don’t necessarily work as well as you think they will. There are cheaper options available that can also do the job well.



How to Clean Composite Decking

The cleaning of your composite deck will require that little bit of extra TLC to maintain the unique look of your composite deck. Take care not to use regular wood cleaners on your composite deck, as these chemicals are often harsh on the surface area and can cause damage to your composite deck surface.

If you prefer a natural approach to deck cleaning, then you can always use home-made DIY recipes such as a simple soap and water solution to keep your deck looking its best.  Simply apply your soapy solution to the surface section-by-section and use a high-pressure sprayer set on low (less than 3000psi), and then spray away to remove stains and dirt easily.

Composite decks are low-maintenance and need only be cleaned every so often to remove common stains such as those caused by food, as well as regular dust and dirt build-up. On the other hand, normal wooden decks require much more maintenance and require regular cleaning to ensure that it remains in good quality.

Composite decks’ unique benefit is that it is not made up of organic material, which makes it less susceptible to damage caused by mold. Thus, you will not have to worry about cleaning as much mold as you would with decks made out of other materials.

Steps for Cleaning Your Composite Deck

  • Clear the deck. Make sure you have ample space to clean your deck by clearing and storing away all outdoor patio furniture. This will also help protect your furniture on the off-chance that it gets ruined accidentally.
  • Pre-spray your deck. Prepare the surface of your composite deck by giving it a quick rinse so as to remove excess dirt before you begin cleaning.
  • Spray the deck with the cleaner. Follow with a gentle scrub using a brush with soft bristles. You can also dilute the cleaning solution by adding water. Leave the cleaner to sit overnight.
  • Rinse thoroughly. After the cleaner has been allowed to sit overnight, rinse it off of the deck thoroughly with a hosepipe or pressure washer.

Cleaning Composite Decking


Cleaning Different Types of Composite Decking

There are a host of things that could cause your composite deck to become dirty and in need of a clean, such as grime, grease, stains, mold, and mildew. You should choose a composite deck cleaner that is formulated to clean these accordingly.


Dirty Wooden Decks

Spray the cleaner onto the deck in an even layer, and then rinse it off well afterward. Use a deck brush to remove any tough stains. Wooden decks may require cleaning with additional detergents. These are usually pre-prepared, although in some cases you may have to do it yourself.

Make sure that your wood decking has been treated with a protective coating of copper quaternary (ACQ) or copper azole (CA) before cleaning it with any detergents. Apply the detergent using a spray applicator or with a mop, and rinse well when finished. If you encounter particularly stubborn stains, you may need to scrub it off first with a deck brush.


Dull or Weathered Wooden Decks

As with any material that is exposed to the outdoor elements, wooden decks (especially those comprised of cedar and redwood) will eventually fade. Rust marks may also appear around screw heads or against the grain of the wood.

In such instances, you can purchase cleaners that will help to brighten the look of your composite deck. These products usually contain chemicals such as bleach, sodium percarbonate, and oxalic acid. They are sprayed onto the surface of the deck floor, scrubbed into the flooring, and then sprayed off with water.


Mold and Mildew

Rainy and damp conditions can cause mold and mildew to grow on the surface of your deck. If left untreated, it will eventually destroy it. Treat mildew (white powdery splotches) and mold (flat black or green spots) as soon as you notice them with a cleaner that contains mildewcide. You must leave this cleaner on – do not it spray off. This will ensure that your deck remains free of mold and mildew.


Painted Decks

Cleaning painted wooden decks is a bit more challenging, as harsh chemical cleaners can ruin the paintwork on the deck. When choosing a cleaning chemical, ensure that it is an all-purpose cleaner that does not contain ammonia. Most cleaning products for painted decks come in a pre-mixed form and can be sprayed onto the deck surface. You can then remove the dirt and grime with a soft cloth.



Frequently Asked Questions


Do Cleaning Products Affect Deck Color?

It depends on the label. Make sure to check the label when choosing cleaning products to ensure that it doesn’t contain harsh ingredients that can affect the deck color.


Can I Clean My Deck With a Soap-and-Water Solution?

You can use a simple solution of soap and water as an alternative to other deck cleaners that would clean your composite deck equally as well. However, this solution may lack the special ingredient that will make your deck last longer, shine brighter, and protect it from mold and mildew damage.


How Long Does It Take to Clean a Composite Deck?

This all depends on the size of your deck as well as the type of cleaner you choose to use, as some take longer than others. As always, read the instructions to get a better idea of how much time it will take to clean your deck.


Is Composite Deck Cleaner Harmful to Pets and Children?

Some products can pose a hazard to children and pets, so always be sure to read the label carefully so as to ensure that it contains ingredients that are safe and non-toxic.


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