Are your outdoor surfaces plagued by green algae, moss, or stubborn dirt? Finding the perfect cleaner can be challenging, but don’t worry—we’ve done the hard work for you.

In this guide, we’ll explore the top-performing outdoor cleaners, focusing on their ease of use, effectiveness, and value for money. Whether you’re looking to revive your patio, decking, fence panels, or garden ornaments, we’ve got options for every need and budget.

Our Editor’s Pick, the Jarder Spray & Leave Cleaner, stood out for its powerful, no-scrub formula that effortlessly transforms outdoor surfaces. Its high coverage and long-lasting effects make it a reliable choice for maintaining clean, fresh-looking patios and driveways.

For those tackling tough algae and moss infestations, the SmartSeal Green Clear Pro impressed us with its custom dilution options and ability to rejuvenate heavily soiled areas.

And if you’re on a budget, the Soluguard Multi-Surface Biocide offers dependable cleaning power and versatility, perfect for multiple surfaces.

But not all products live up to their promises. Our One to Avoid, the One Chem Heavy Duty Patio Cleaner, fell short in performance, requiring excessive effort with disappointing results.

Ready to reclaim your outdoor spaces? Read on to discover which cleaner is best suited to your needs and find out how these products can save you time, effort, and frustration. Whether you’re sprucing up for an event or maintaining your garden’s beauty year-round, this guide has you covered.

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Choosing the Right Fence Algae Cleaner

When choosing the best fence algae remover, it’s essential to understand the features and performance you should expect from a high-quality product. Here’s a breakdown of the key features that should be given when evaluating any algae remover:

Must-Have Features:

1. Effective Algae and Moss Removal: The product should reliably remove green algae, moss, and similar biological growths from fences and other outdoor surfaces.
2. Non-Caustic and Safe Formula: Look for bleach-free, biodegradable options that won’t harm plants, pets, or the environment.
3. Ease of Application: The cleaner should be simple to use—preferably spray-on with minimal scrubbing required.
4. Wide Surface Compatibility: The remover should work on various materials, including wood, brick, stone, and UPVC.
5. Preventative Action: A good algae remover should not only clean but also help prevent regrowth for several months.
6. Cost-Effectiveness: High coverage per litre and concentrated formulas are essential for tackling large areas.

Design and Build Quality

The design and formulation of an algae remover significantly impact its performance and usability.

• Packaging and Application: Look for sturdy bottles or containers with clear dilution ratios and instructions. Products with built-in sprayers or those compatible with garden sprayers offer convenience.
• Concentrate vs. Ready-to-Use: Concentrates are more economical and suitable for larger areas, while ready-to-use formulas are ideal for smaller, quick applications.
• Weather Resistance: Ensure the product performs well in typical outdoor conditions (e.g., damp environments) without degrading or losing effectiveness.

Added Features That Boost Effectiveness

While not mandatory, these additional features can elevate a product’s value and convenience:

1. Customisable Dilution Ratios: Flexibility to adjust the strength of the solution based on contamination levels.
2. Quick Results: Products with visible results within 24-48 hours save time and effort.
3. Non-Staining Formula: Ensures the product won’t discolour your fences or other treated surfaces.
4. Eco-Friendliness: Certifications for being environmentally safe add peace of mind.
5. Versatility: A product that doubles as a cleaner for patios, decking, roofs, and furniture increases utility.
6. Long Shelf Life: Products that can be stored for extended periods without losing potency are a practical choice for ongoing maintenance.

By considering these expectations, you can make an informed decision and choose an algae remover that meets both your cleaning needs and your budget.

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Editors Pick

Jarder Spray & Leave 4 x 5 Litre Concentrate Cleaner

The Jarder Spray & Leave Cleaner is an easy-to-use, powerful solution for eliminating green mould and algae on outdoor surfaces. With its concentrated formula, versatile application, and long-lasting effects, it’s a reliable choice for maintaining patios, decking, fences, and more.

Key Features:

• Effortless Cleaning: Simply spray and leave. No scrubbing, rinsing, or pressure washing is required, making the entire cleaning process stress-free and efficient.
• High Coverage: Each 5-litre bottle creates up to 33 litres of solution, providing ample coverage for an area of approximately 240m², ensuring large-scale cleaning projects are easily managed.
• Versatile Use: Perfect for patios, driveways, fences, roofs, UPVC windows, greenhouses, and garden statues. It works effectively on a wide variety of outdoor hard surfaces.
• Long-Lasting Results: Not only does it remove mould and algae, but it also prevents regrowth for up to six months, keeping surfaces clean and well-maintained for an extended period.
• Safe Formula: The formula is non-caustic, bleach-free, biodegradable, and pH neutral, ensuring it is safe for both the environment and your family, including children and pets, once dried.

We recently tested the Jarder Spray & Leave Cleaner, and it delivered impressive results. The application was straightforward: mix the solution, spray it on the affected surfaces, and let it do its job. Within days, we saw visible improvements as green algae stains and algae began to fade.

The cleaners excelled on patios and wooden decking, leaving them looking refreshed. We appreciated the large coverage area and the product’s ability to work without scrubbing, saving both time and effort. While some stubborn stains required a stronger mix, the overall performance was outstanding.

If you’re after a no-fuss, effective solution for outdoor cleaning, the Jarder Spray & Leave Cleaner is an excellent option. It’s easy to use, cost-effective, and delivers long-lasting results.

Runner Up

SmartSeal Green Clear Pro Powerful Green Algae Remover

The SmartSeal Green Clear Pro is a versatile and powerful algae remover designed to restore outdoor surfaces. Its advanced formula effectively eliminates green algae, moss, and black lichen, leaving patios, decking, roofs, and fences looking refreshed.

Key Features:

• Effective Green Growth Removal: Targets algae, moss, and lichen with a microbiological biocide for swift and thorough cleaning. Perfect for use on patios, fences, decking, and roofs.
• Customisable Dilution: Mix ratios are adjustable based on your needs:
  • 1:5 for heavy contamination
  • 1:10 for regular cleaning
  • 1:20 for preventative maintenance
• High Coverage: Each 5-litre container covers up to 200m² at a 1:10 dilution ratio, providing excellent value for larger projects.
• Safe Formula: Bleach-free and acid-free, making it safe for use year-round on most surfaces without risk of staining.
• Easy Application: Apply using a garden sprayer in 8-20°C weather. Minimal preparation is required, though brushing is recommended for heavy growth.

We tested the SmartSeal Green Clear Pro on a moss-covered patio and saw impressive results. The application process was simple—mix the solution, spray it onto the surface, and let it work. After a short time, the algae and moss began to break down, revealing a clean and refreshed surface.

Its cost-effective coverage stood out, allowing us to treat a large area with minimal product usage. The solution worked especially well on decking and fences, though heavily contaminated areas benefited from a second application.

If you’re looking for a reliable, easy-to-use outdoor cleaner that delivers long-lasting results, the SmartSeal Green Clear Pro is an excellent choice. Its combination of efficiency, safety, and cost-effectiveness makes it a standout for outdoor maintenance.

Budget Pick

Soluguard Multi-Surface Biocide - 5L - High Strength

The Soluguard Multi-Surface Biocide is a high-strength, ready-to-use cleaner designed for removing biological growth like mould, algae, and dirt from a wide range of surfaces. Its powerful formula and versatile application make it an ideal choice for both indoor and outdoor cleaning.

Key Features:

• Effortless Application: Ready to use with no mixing required. Apply using a brush, roller, or sprayer for quick and efficient coverage.
• Multi-Surface Compatibility: Works effectively on brick, stone, wood, tiles, plastic, and mortar, making it suitable for diverse cleaning tasks.
• Biocidal Cleaning Power: Eliminates and loosens green algae, mould, and dirt, ensuring a clean surface for treatments like Stormdry Masonry Protection Cream.
• Low Odour and Non-Flammable: Safe and comfortable to use without strong chemical smells or fire risks.
• Non-Staining Formula: Leaves surfaces clean without discolouration.

We tested the Soluguard Multi-Surface Biocide on several problem areas, including wooden fences, patio slabs, and k-rend walls. The application was simple using a garden sprayer, and we noticed results within 24-48 hours.

Green algae and dirt were easily removed, restoring surfaces to a clean, fresh state. However, tougher stains, like black marks and lichens, required additional cleaning.

The product excelled in preparing surfaces for repainting or additional treatments. For instance, fences coated with algae were completely cleared, making them ready for a fresh coat of paint. It also worked well on plastic and garden furniture, proving its versatility.

The Soluguard Multi-Surface Biocide is a dependable solution for tackling biological growth and grime on a variety of surfaces. While it may not completely remove stubborn stains like black mould, it’s a great option for general cleaning and surface preparation.

Easy to use and effective, it’s a valuable addition to your cleaning toolkit.

Easy To Use Pick

Sodium Hypochlorite HIGH STRENGTH Algae Remover

The Sodium Hypochlorite High Strength Algae Remover is a powerful solution for cleaning patios, driveways, and outdoor surfaces. With its high-strength formula, effective weed control, and quick results, it’s an excellent choice for tackling tough stains, moss, and algae.

Key Features:

• Effective Cleaning: Removes moss, algae, lichen, and even stubborn black spots with ease. Ideal for patios, driveways, brickwork, walls, and fences.
• Weed Control: Not only cleans but also deters regrowth of weeds and algae for weeks or even months.
• Quick Results: Apply the solution, and within minutes, you’ll see noticeable improvements in treated areas.
• Versatile Applications: Can be used for water purification, odour removal, and other lab-related purposes, in addition to outdoor cleaning.
• High-Strength Formula: Delivers excellent results when diluted appropriately, with the ability to tackle even heavily stained areas.

We recently tested the Sodium Hypochlorite High Strength Algae Remover, and it delivered impressive results. Following the recommended dilution of 3 parts water to 1 part bleach, we applied it to a neglected patio.

The results were immediate and striking, with grime and moss lifting effortlessly. For tougher stains, a second application made a noticeable difference.

The product’s versatility stood out, as it worked effectively on brick walls and stone surfaces too. However, precautions are essential—wearing gloves, a mask, and protective eyewear is a must due to the strong fumes and potential skin irritation.

If you’re looking for a reliable, heavy-duty cleaning solution for outdoor spaces, the Sodium Hypochlorite High Strength Algae Remover is an excellent option. It’s easy to use, cost-effective, and delivers professional-quality results.

Safest Algae Remover Pick

Render Cleaner Softwash Solution - Acid-Free Render & Masonry Cleaner

The Render Cleaner Softwash Solution is a professional-grade cleaning agent designed to tackle algae, lichen, and grime on render, stone, and masonry surfaces. With its powerful formula, easy application, and rapid results, it’s a reliable choice for maintaining the cleanliness of your home’s exterior.

Key Features:

• Effortless Cleaning: Simply spray the solution, let it dwell for 15 minutes, and rinse. No scrubbing is needed, making it a stress-free cleaning process.
• High Coverage: A 5-litre bottle, when diluted at a 1:3 ratio, covers up to 100m², making it suitable for large cleaning projects.
• Versatile Use: Ideal for render, masonry, brick, roof tiles, pebble dash, and concrete surfaces. It works effectively on vertical walls, roofs, and patios.
• Rapid Results: Quickly eliminates green and red algae, with black lichens requiring minimal additional effort. Results are visible within minutes of application.
• Powerful Formula: While highly effective, it’s safe for professional and DIY use. Dilute as needed for the level of cleaning required.

We tested the Render Cleaner Softwash Solution and were impressed with its performance. The application was straightforward: spray the solution on the surface, keep it wet for the recommended dwell time, and rinse thoroughly.

Stubborn areas benefited from a second pass, but even a single application made a significant difference. The cleaner excelled on both weathered render and block paving, leaving surfaces noticeably refreshed.

While the strong bleach-like smell necessitates wearing protective gear, the results more than justify the effort. The solution’s ability to handle tough algae and lichen made it a standout product.

If you’re looking for a fast, effective solution for exterior cleaning, the Render Cleaner Softwash Solution is an excellent choice. It’s easy to use, delivers impressive results, and restores surfaces to their former glory.

One To Avoid

One Chem - 5L Heavy Duty Patio Cleaner Algae Remover

We tested the One Chem - 5L Heavy Duty Patio Cleaner with high expectations, hoping it would tackle lichen, algae, and grime effectively. Unfortunately, this product was underwhelming in almost every way.

While it might serve as a basic dirt cleaner (though nothing extraordinary), it fell short of its claims. Even when diluted as instructed, it failed to lift green mould, moss, or stubborn green stains. Trying higher concentrations—including using it neat—produced little to no visible improvement.

The cleaner also required excessive effort to use, making the whole process incredibly time-consuming and frustrating. We appreciate that it’s easy to dilute and apply, but those are minor positives overshadowed by the lack of results.

The patio looked no different, and we could have achieved better outcomes with basic pressure washing or even water and scrubbing.

Ultimately, this cleaner overpromises and severely underdelivers. If you’re seeking an efficient solution for patio cleaning, we recommend skipping this product—it’s simply not worth your time, effort, or money. (There are far better alternatives available for much less.)

How We Evaluated and Chose the Best Fence Algae Removers on the Market

Finding the best fence algae remover requires more than just a quick spray and rinse. We conducted thorough testing to identify products that truly deliver results. Here’s how we approached the task:

Performance Testing

We evaluated each remover’s ability to eliminate algae, moss, and grime from various surfaces, including fences, patios, and decking. Testing included measuring how quickly visible results appeared and whether the products prevented regrowth over time.

Ease of Application

We focused on how user-friendly each product was. Did it require complex mixing or specialised tools? Was the application process straightforward? Products were tested for their compatibility with sprayers, brushes, and rollers, as well as how easily they could be rinsed off or left to dry.

Coverage and Cost-Effectiveness

Each product’s coverage per litre was assessed to see how much area it could treat. We compared the cost per square meter to determine overall value, ensuring the best picks offered high performance at a reasonable price.

Safety and Environmental Impact

Safety is a critical factor. We tested for non-toxic, biodegradable formulas that wouldn’t harm plants, pets, or surfaces. Additionally, we checked if the products left stains or residues behind after use.

Longevity of Results

We monitored treated areas for several weeks to assess the products’ ability to prevent regrowth, a key factor for maintaining clean fences and patios.

Design and Packaging

We evaluated the durability of the packaging, clarity of instructions, and whether the product was available in convenient sizes for various project scopes.

Extra Features

Products with customisable dilution ratios, quick-acting formulas, or versatility across multiple surfaces earned extra points. We also appreciated formulas that worked well in different weather conditions or included additional benefits like preparing surfaces for painting.

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Frequently Asked Questions

What Is a Natural Killer of Algae?

A natural killer of algae is vinegar or a mixture of water and baking soda. These household solutions are eco-friendly and effective at breaking down algae on outdoor surfaces. They work by altering the pH levels, making the environment unsuitable for algae growth.

What Can I Put on My Fence to Stop It Going Green?

To stop your fence from going green, apply a protective sealant or algae-resistant treatment. Regularly cleaning the fence with a biocide or an algae remover can also prevent algae buildup. Additionally, maintaining proper drainage around the fence can reduce moisture and discourage algae growth.

Can I Just Paint Over Green Algae on Fence?

You should not paint over green algae on a fence. Painting without cleaning allows algae to thrive beneath the paint, leading to peeling and discolouration. Instead, thoroughly clean and treat the surface to remove algae before applying a primer and paint for long-lasting results.

What Is the Best Algae Eater?

The best algae eater for outdoor surfaces is a high-strength cleaner or biocide specifically formulated to target algae, moss, and grime.

These products are designed to penetrate and eliminate algae effectively, preventing regrowth and restoring the surface’s original appearance without requiring excessive scrubbing.

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Final Word

We hope our guide to the best fence algae removers has helped you find the perfect solution for your outdoor cleaning needs. With so many great options to choose from, selecting the right product can be tricky, but our top pick stands out.

The Jarder Spray & Leave Cleaner impressed us with its no-scrub formula, wide coverage area, and long-lasting results. It's an easy and effective way to restore fences, patios, and more to their former glory without the hassle.

If you’re battling heavy algae and moss buildup, the SmartSeal Green Clear Pro is another excellent choice, offering customisable dilution options and powerful cleaning action. For those on a budget, the Soluguard Multi-Surface Biocide delivers dependable performance and versatility.

However, we advise avoiding the One Chem Heavy Duty Patio Cleaner, which failed to deliver results despite repeated applications. Save your time and money with one of our recommended picks instead!