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10 Best Composite Deck Cleaners 2025 in the UK

#1

Winner

9.7 score

Wet & Forget Mould, Lichen & Algae Remover, Outdoor Cleaning Solution, Black Mould Remover, Bleach Free, 5 Litre

Cleaning Power: bleach-free
Safety: protective gear recommended
Ease of Use: spray and leave
Compatibility: multiple surfaces
Coverage Area: 100-300m2
Drying Time: longer drying

Chosen by 1345 this week

Wet & Forget Rapid Application Mould Lichen and Algae Remover, Outdoor Cleaning Solution, Black Mould Remover, Bleach Free, 2 Litre

Cleaning Power: Cleans mould, mildew, algae without scrubbing
Safety: Bleach-free; use gloves and eye protection
Ease of Use: Attach to hose; Reach Nozzle included
Compatibility: Stone, glass, roofs, patios, driveways
Coverage Area: Covers 200m2; reaches 8 meters high
Drying Time: Depends on weather; no rain needed

Jarder Spray & Leave 4 x 5 Litre Concentrate Cleaner - Patio Fencing Decking - Green Mould & Algae Killer (20L)

Cleaning Power: tackles mould and algae, no scrubbing
Safety: biodegradable, non-caustic, safe when dry
Ease of Use: easy mix-and-spray method
Compatibility: works on many hard surfaces
Coverage Area: 240 square meters
Drying Time: 2-3 days
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Our Top Picks

#1

Winner

Wet & Forget Mould, Lichen & Algae Remover, Outdoor Cleaning Solution, Black Mould Remover, Bleach Free, 5 Litre

Rating
9.7
Chosen by1,345
Cleaning Power
Ease of Use
Compatibility
Cleaning Power
Remarkably effective, this product worked quicker than expected, removing green build-up in about a week.
Ease of Use
Ease of use stands out, with a spray-and-leave method making cleaning hassle-free.
Compatibility
Versatile application on wood, stone, and metal surfaces, effectively tackling green algae.
Coverage Area
Ideal for sunny areas, it showed impressive results on pavers exposed to some sunlight.

Wet & Forget Mould, Lichen & Algae Remover is an effective solution for those looking to tackle outdoor mould and mildew issues without the need for scrubbing. It excels in cleaning power, thanks to its bleach-free formula, which permits application on a wide range of surfaces, including roofs, bricks, and natural stones. This versatility makes it suitable for various outdoor cleaning tasks, such as patios and driveways. The product's biodegradable nature aligns with environmental considerations and contributes to its appeal in 'Climate Pledge Friendly' categories.

Ease of use is one of the standout features of this cleaner. The 'spray and leave' method is hassle-free, allowing users to apply the solution and let it work without manual labor. This can be particularly beneficial for those with large cleaning areas, as the product covers between 100-300m2 when diluted appropriately.

Safety is addressed through recommendations for protective gear during application, ensuring user precautions are prioritized. However, users should be mindful of the contact time required before rain – at least 5 hours – which might limit immediate usability in unpredictable weather conditions. Regarding compatibility, the product can be applied to multiple surfaces, although it's crucial to test on a small area first to guarantee no adverse effects.

While the Wet & Forget solution may take longer to dry compared to instant cleaners, its non-scrub and expansive coverage benefits outweigh this drawback for many users. The product's effectiveness is reflected in positive customer reviews, scoring an impressive 4.4 out of 5 stars, demonstrating its reliability and user satisfaction.

Rating
9.7
Chosen by1,345
Cleaning Power
Ease of Use
Compatibility
Cleaning Power
Remarkably effective, this product worked quicker than expected, removing green build-up in about a week.
Ease of Use
Ease of use stands out, with a spray-and-leave method making cleaning hassle-free.
Compatibility
Versatile application on wood, stone, and metal surfaces, effectively tackling green algae.
Coverage Area
Ideal for sunny areas, it showed impressive results on pavers exposed to some sunlight.
#2

Pro-Kleen MY16 Patio Cleaner Simply Spray and Walk Away Green Mould and Algae Killer for Patios, Fencing and Decking 5 Litre Concentrate (Makes 25 litres)

Rating
9.4
Cleaning Power
Ease of Use
Drying Time
Cleaning Power
It effectively lifts algae, providing great value for money and convenience.
Ease of Use
The product is exceptionally easy to use, requiring no scrubbing before or after application.
Drying Time
Simply spray and walk away to see visible results in just a few hours.

The Pro-Kleen MY16 Patio Cleaner offers a powerful cleaning solution for outdoor spaces, effectively tackling green mould and algae without the need for scrubbing or pressure washing. It’s designed for use on a variety of hard surfaces, including patios, decking, fences, and more, making it a versatile option for homeowners.

The high-strength super concentrate allows a 5L bottle to create 25L of solution, covering a substantial area of 175m², which is excellent for larger spaces. Its formula includes 50% more active ingredients compared to competitors, promising better performance and longer-lasting results, up to six months of regrowth protection. This can save time and effort in maintaining clean outdoor spaces.

One of the notable strengths of Pro-Kleen MY16 is its safety profile. With a non-caustic, biodegradable formula free of acids, bleach, and harmful chemicals, it’s safe for families and pets once dry, providing peace of mind for households with children and animals. The ease of use is another highlight, as users simply mix, spray, and walk away, with visible results appearing in a few days. This convenience reduces the labor typically associated with outdoor cleaning.

However, there are some drawbacks. The product requires a garden sprayer or watering can for application, which may be an additional purchase for some users. Also, while it’s highly effective on a variety of surfaces, the drying time can vary depending on weather conditions, potentially delaying the time before the area is safe for pets and children. Pro-Kleen MY16 is a robust and safe outdoor cleaner that offers extended coverage and ease of use, making it a solid choice for those looking to maintain large outdoor areas with minimal effort.

Rating
9.4
Cleaning Power
Ease of Use
Drying Time
Cleaning Power
It effectively lifts algae, providing great value for money and convenience.
Ease of Use
The product is exceptionally easy to use, requiring no scrubbing before or after application.
Drying Time
Simply spray and walk away to see visible results in just a few hours.
#3

Wet & Forget Rapid Application Mould Lichen and Algae Remover, Outdoor Cleaning Solution, Black Mould Remover, Bleach Free, 2 Litre

Rating
9.1
Cleaning Power
Ease of Use
Compatibility
Cleaning Power
A remarkable product that delivers visible results, effortlessly cleaning moss and algae in just 24 hours.
Ease of Use
Easy application with a hose connection simplifies the cleaning process across multiple surfaces, from caravans to country homes.
Compatibility
Transforms surfaces over time, offering a clean, fresh smell and requiring no scrubbing—perfect for roofs, window sills, stone, and decking.

The Wet & Forget Rapid Application Mould Lichen and Algae Remover is a powerful outdoor cleaner designed to tackle mould, mildew, and algae without the need for scrubbing. Its cleaning power is a major strength, effectively working with just a simple spray and soak method. The product is bleach-free, which makes it safer for a variety of surfaces, including stone, glass, and pavers. However, protective gloves and eye protection are advised during application, indicating that the solution is not entirely risk-free.

Ease of use is a highlight, as the product can be attached to a standard hose, allowing for easy mixing and spraying. The Reach Nozzle is particularly handy for larger coverage areas, capable of spraying up to 200m2 in ten minutes, and reaching heights of up to 8 meters. This makes it suitable for cleaning taller buildings or hard-to-reach areas.

The compatibility with multiple surfaces is a plus, as it can be applied to roofs, patios, driveways, and even solar panels without damage. However, the drying time is dependent on weather conditions, requiring application on days with no rain forecasted to ensure effectiveness. The 2-litre size offers a good balance between volume and weight, although for larger jobs, more product may be needed. It has received positive feedback, with a 4.4 out of 5-star rating from over a thousand users, indicating customer satisfaction. Some users might prefer a scented option as this product is unscented.

In conclusion, the Wet & Forget mould remover is a strong choice for those looking for a versatile and efficient outdoor cleaning solution, with the main caution being the need for protective gear during use.

Rating
9.1
Cleaning Power
Ease of Use
Compatibility
Cleaning Power
A remarkable product that delivers visible results, effortlessly cleaning moss and algae in just 24 hours.
Ease of Use
Easy application with a hose connection simplifies the cleaning process across multiple surfaces, from caravans to country homes.
Compatibility
Transforms surfaces over time, offering a clean, fresh smell and requiring no scrubbing—perfect for roofs, window sills, stone, and decking.

Buying Guide for the Best Composite Deck Cleaners

Choosing the right composite deck cleaner is essential to maintaining the beauty and longevity of your deck. Composite decks are made from a combination of wood fibers and plastic, which makes them durable and low-maintenance. However, they still require regular cleaning to prevent mold, mildew, and stains. When selecting a composite deck cleaner, it's important to consider several key specifications to ensure you get the best product for your needs.
Cleaning PowerCleaning power refers to the effectiveness of the cleaner in removing dirt, stains, mold, and mildew from your composite deck. This is important because a cleaner with strong cleaning power will save you time and effort while ensuring your deck looks its best. Cleaners can be categorized into light-duty, medium-duty, and heavy-duty. Light-duty cleaners are suitable for regular maintenance and minor dirt, medium-duty cleaners are good for moderate stains and grime, and heavy-duty cleaners are designed for tough stains and deep cleaning. Choose a cleaner based on the current condition of your deck and the type of stains you need to remove.
SafetySafety refers to how safe the cleaner is for you, your family, pets, and the environment. This is important because some cleaners contain harsh chemicals that can be harmful if inhaled or come into contact with skin. Look for cleaners that are labeled as non-toxic, biodegradable, and environmentally friendly. These cleaners are safer to use and less likely to cause harm to plants and animals around your deck. If you have children or pets, prioritize safety to ensure their well-being.
Ease of UseEase of use refers to how simple and convenient the cleaner is to apply and rinse off. This is important because a cleaner that is easy to use will make the cleaning process quicker and less labor-intensive. Some cleaners come in ready-to-use spray bottles, while others require mixing with water. Ready-to-use cleaners are more convenient but may be more expensive, while concentrated cleaners that need mixing can be more economical but require more effort. Consider your preference and the amount of time you have for cleaning when choosing a cleaner.
CompatibilityCompatibility refers to whether the cleaner is suitable for use on composite decking materials. This is important because using a cleaner that is not compatible with composite materials can cause damage or discoloration. Always check the product label to ensure it is specifically designed for composite decks. Some cleaners are multi-surface and can be used on various materials, but it's best to choose one that explicitly states it is safe for composite decking to avoid any potential issues.
Coverage AreaCoverage area refers to the amount of surface area a cleaner can effectively clean per unit of product. This is important because it helps you determine how much cleaner you will need to purchase to cover your entire deck. Cleaners with higher coverage areas are more efficient and cost-effective. Coverage is usually measured in square feet per gallon. To choose the right cleaner, measure the total area of your deck and compare it with the coverage information provided on the cleaner's label. This will help you estimate the quantity needed for a thorough cleaning.
Drying TimeDrying time refers to how long it takes for the deck to dry after cleaning. This is important because a shorter drying time means you can use your deck sooner. Drying times can vary based on the cleaner's formulation and weather conditions. Some cleaners are designed to dry quickly, while others may take several hours. If you need to use your deck soon after cleaning, look for a cleaner with a fast drying time. However, if you have the flexibility to wait, drying time may be less of a concern.