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10 Best Composite Deck Cleaners 2025 in the United States

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Our Top Picks

#1

Winner

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Xtreme Reach Hose End with New & Improved Nozzle, 48 Fluid Ounces

The Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover is a versatile cleaner designed for multi-surface use, including composite decks. One of its main strengths is the new and improved nozzle, which attaches to a garden hose and offers two spray options: a jet tip for targeting specific stains up to 30 feet away and a fan tip for quicker applications on larger surfaces like decks. This makes it user-friendly for various outdoor cleaning tasks.

The product's bleach-free and non-acidic formula enhances safety, making it less harmful to plants and safe for use around the home, provided you follow guidelines to avoid contact with water bodies and rinse nearby plants before and after use. Furthermore, it has an impressive coverage area, treating up to 2,000 square feet per bottle, which is cost-effective for larger cleaning projects.

This cleaner works over time with natural elements like wind and rain, with green stains typically clearing up in 1-2 weeks, while more stubborn stains may take several months. This delayed result might be a downside for those seeking immediate cleaning effects. It also leaves no residue, which is beneficial for maintaining the appearance of your surfaces. However, the requirement to apply the product on dry days with temperatures above 55° F and no rain forecasted within 4-5 hours could limit its usability during certain seasons. This product is ideal if you seek a hands-off, long-term cleaning approach and prioritize safety and large coverage, but it may not be suitable if you need quick results.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Cleaning Power
The cleaner does a great job and lasts for the better part of a year, reducing buildup significantly.
Application Method
It works amazingly well and is easy to use, making it a repeat purchase.
#2

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Ready to Use, 64 Ounce

The Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover is an effective composite-deck cleaner that excels in its cleaning power, capable of removing green and black stains without requiring scrubbing, rinsing, or pressure washing. This makes it highly convenient for users looking for hassle-free cleaning solutions. It covers multiple surfaces, including porch steps, headstones, fountains, and even upholstery, showcasing its versatility.

The attached high-capacity trigger sprayer ensures easy application, and the product works over time with natural elements like wind and rain to clean surfaces, which means less effort on the user's part. However, it's important to note that while green stains may clean up relatively quickly (within 1-2 weeks), more stubborn stains can take several months to fully disappear, which might be a drawback for those seeking immediate results. Safety-wise, the product is bleach-free and non-acidic, which is a plus, but users need to be cautious around water bodies and plants, ensuring to spray 100 feet away from lakes, ponds, rivers, and streams and to flush plants with water before and after application to avoid harm.

The product's unlimited shelf life is a significant advantage, and it treats a substantial area of 60 - 180 square feet depending on the stain and surface. While it is unscented, which might appeal to those sensitive to strong smells, users should be aware that it requires application on dry days when rain is not expected within 4-5 hours and when temperatures are above 32°F to avoid rapid evaporation and ensure effectiveness. This product is ideal for homeowners who want a low-maintenance, long-term solution for outdoor cleaning, although patience is required for the best results.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Cleaning Power
The Wet & Forget Outdoor cleaner effectively removes green and black stains without scrubbing, rinsing, or pressure washing, making it a hassle-free solution.
Safety
Safety-wise, the product is bleach-free and non-acidic, but users need to be cautious around water bodies and plants.
Application Method
Users should apply the product on dry days when rain is not expected within 4-5 hours and when temperatures are above 32°F to ensure effectiveness.
Compatibility
This product excels in versatility, capable of cleaning porch steps, headstones, fountains, and even upholstery.
#3

30 Seconds Outdoor Cleaner Concentrate, 1.3 Gallon

The 30 SECONDS Outdoor Cleaner Concentrate is a versatile cleaning solution designed to tackle stains from mold, mildew, dirt, and grime on various outdoor surfaces, including composite decks. Its powerful concentrated formula makes it economical; you simply mix it with water in a 1:1 ratio for effective cleaning. The product works quickly, producing immediate results, which is great for those who want to see fast improvements in their outdoor areas.

Additionally, it covers up to 1800 square feet, making it suitable for larger cleaning projects. Safety is a notable strength of this cleaner, as it is safe for use around plants and lawns when used as directed. The formula breaks down into the soil after rinsing, minimizing environmental impact. However, users should be cautious and follow the instructions closely to avoid any potential harm to vegetation.

In terms of compatibility, it works well on a wide range of materials, including concrete, bricks, masonry, siding, and more, making it a versatile choice for various outdoor cleaning tasks. One downside could be the need to mix the concentrate with water, which might be inconvenient for some users compared to ready-to-use products. Additionally, as it comes in a spray form, it might require more physical effort for extensive cleaning areas. The 30 SECONDS Outdoor Cleaner Concentrate is a reliable and effective cleaner for composite decks and other outdoor surfaces, offering strong cleaning power and safety for plants and lawns, although the mixing process and manual application may require a bit of extra effort.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Cleaning Power
Gets white siding sparkling clean and is better for the environment and pets.
Safety
Gets white siding sparkling clean and is better for the environment and pets.
Application Method
For heavily soiled areas, it requires letting it sit and some scrubbing along with a pressure washer.
Compatibility
Did not work well on cement, leaving stains mostly unchanged.

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. Cleaners can be divided 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 more stubborn stains and moderate mold or mildew. Heavy-duty cleaners are best for heavily soiled decks or those with significant mold and mildew growth. Choose a cleaner based on the current condition of your deck and the type of dirt or 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. Cleaners can be categorized as eco-friendly, biodegradable, or chemical-based. Eco-friendly and biodegradable cleaners are generally safer for the environment and less likely to cause irritation. Chemical-based cleaners may be more effective but can be harsher. If you have children or pets, or if you prefer environmentally friendly products, opt for an eco-friendly or biodegradable cleaner.
Application MethodThe application method refers to how the cleaner is applied to the deck. This is important because it affects the ease and convenience of the cleaning process. Cleaners can be applied using a spray bottle, a pump sprayer, or a brush. Spray bottles are convenient for small areas and spot cleaning. Pump sprayers are ideal for larger areas and provide even coverage. Brushes are useful for scrubbing stubborn stains. Consider the size of your deck and your preferred method of application when choosing a cleaner.
CompatibilityCompatibility refers to whether the cleaner is suitable for use on composite decking. This is important because some cleaners designed for wood or other materials may damage composite decks. Always check the product label to ensure it is specifically formulated for composite decking. Using a cleaner that is not compatible with composite materials can lead to discoloration or damage to your deck.
ConcentrationConcentration refers to the strength of the cleaner and whether it needs to be diluted before use. This is important because concentrated cleaners can be more economical and allow you to adjust the strength based on your cleaning needs. Cleaners can be ready-to-use or concentrated. Ready-to-use cleaners are convenient and require no mixing, making them ideal for quick and easy cleaning. Concentrated cleaners need to be diluted with water, which can be more cost-effective and allow you to control the cleaning power. Choose a ready-to-use cleaner for convenience or a concentrated cleaner for flexibility and cost savings.
ResidueResidue refers to any leftover film or substance that remains on the deck after cleaning. This is important because residue can attract dirt and make your deck look dull. Some cleaners leave no residue, while others may require rinsing to remove any leftover film. Cleaners that leave no residue are ideal for a spotless finish and less maintenance. If you prefer a cleaner that requires minimal rinsing and leaves no residue, look for products that are specifically labeled as no-rinse or residue-free.

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