Ronseal Decking Cleaner & Reviver, 5 Litre vs Wet & Forget Rapid Action Outdoor Treatment, Moss, Mould & Algae Remover, 5 Litre: Which Patio & Decking Is Better?
Published 2026-07-29 · Updated 2026-07-29
The Nest & Yard editorial team
Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-07-29.
Our pick: the Ronseal Decking Cleaner & Reviver, 5 Litre — the best Patio & Decking we tested, from £20.99.
When it comes to reviving tired patio and decking, two leading products consistently appear in homeowner wishlists: the Ronseal Decking Cleaner & Reviver and the Wet & Forget Rapid Action Outdoor Treatment. The Ronseal offers a more traditional cleaning approach at a slightly lower price point, backed by strong customer reviews, while Wet & Forget’s formula promises a quicker, often-cited solution for tackling moss, mould, and algae – though it comes with a higher cost. Let's break down the key differences between these two popular treatments to help you decide which is best suited for your outdoor space.
See the full range in Patio & Decking.
Planning ahead? Try our free Decking Screw Calculator →| Ronseal Decking Cleaner & Reviver, 5 Litre | Wet & Forget Rapid Action Outdoor Treatment, Moss, Mould & Algae Remover, 5 Litre | |
|---|---|---|
| Price | £20.99 | £23.99 |
| Rating | Rated 4.5 out of 5 stars (2,540) | Rated 4.5 out of 5 stars (2,100) |
| Material | Chemical Treatment | Liquid Concentrate |
| Price | Budget | Mid-range |

#1 Pick
Ronseal Decking Cleaner & Reviver, 5 Litre- Chemical Treatment
£20.99
Pros
- Removes dirt, algae and mildew to restore decking colour
- Opens wood pores ready for oil or stain
- Covers up to 25 square metres per 5L
Cons
- Needs a stiff brush and rinsing for best results

#2 Pick
Wet & Forget Rapid Action Outdoor Treatment, Moss, Mould & Algae Remover, 5 Litre- Liquid Concentrate
£23.99
Pros
- Spray and leave — no scrubbing or rinsing needed
- Bleach-free formula is safe for plants nearby
- One bottle makes up to 30L of solution
Cons
- Results take days to weeks to appear
FAQ
What size bottles do the Ronseal products come in?+
Both the Decking Cleaner & Reviver and Wet & Forget Rapid Action come in 5-litre containers, which is generally sufficient for treating a standard sized patio or decking area (around 30-40 square metres). Larger areas may require additional purchases, so it's worth calculating your surface area beforehand.
What types of decking materials are these products suitable for?+
Both formulations are designed to work on most common decking materials including treated timber, composite decking, and even some hardwoods. However, always test a small, inconspicuous area first to ensure compatibility and avoid damage, particularly with newer composite decks.
How much do the Ronseal products typically cost?+
The Ronseal Decking Cleaner & Reviver usually retails between £25 - £35 on Amazon UK, while the Wet & Forget Rapid Action treatment is generally priced around £20 - £30. Prices can fluctuate depending on sales and promotions.
How often should I apply these products to my decking?+
The Wet & Forget product is designed for frequent application – typically every 6-8 weeks, especially during wetter months, to maintain ongoing protection against moss and algae. The Ronseal Cleaner & Reviver may be applied less frequently (every 3-6 months) depending on the level of cleaning required.
Are there any safety precautions I should take when using these products?+
Always wear gloves and eye protection when applying either product, as they can cause skin irritation. Ensure adequate ventilation and avoid splashing onto surrounding plants or paving – read the manufacturer's instructions carefully for specific hazards.
What’s the difference in application methods?+
The Ronseal Cleaner & Reviver requires manual scrubbing to lift dirt and stains, followed by rinsing, whereas Wet & Forget is a spray-on treatment that delivers a protective film. This makes Wet & Forget quicker for initial application but may need more frequent reapplication.
How do these products perform in the winter?+
Both products continue to offer protection during the winter months, though their effectiveness might be reduced by heavy rainfall and snow. Regular reapplications are crucial after periods of significant weather exposure.
Are there alternative patio cleaning solutions available on Amazon UK?+
Yes, a wide range of patio cleaners and moss removers are available on Amazon UK, including options from brands like OOKAYS and Liquitex. Consider factors such as coverage area, application method, and specific ingredients when comparing.
Do I need to prepare my decking before applying these products?+
For the Ronseal Cleaner & Reviver, it’s best to remove loose dirt and debris with a broom or low-pressure cleaner. Wet & Forget is generally ready for application, but ensure the surface is dry before spraying.
What are the warranty/returns terms for these products?+
Warranty details and returns policies are governed by Amazon UK’s standard procedures, which can be found within their customer service section. Refer to Amazon's policy for information regarding eligible returns and potential refunds.
In depth
Choosing the right treatment for your patio or decking is far more than just picking a product that *looks* like it’ll solve the problem; it's an investment in longevity and appearance. Here at Home & Garden Buying Guide, our approach to evaluating products like the Ronseal Decking Cleaner & Reviver and the Wet & Forget Rapid Action Outdoor Treatment centres on several key criteria. Primarily, we assess performance – how effectively does each product actually tackle the issues of mould, algae, moss, and general weathering? We achieve this through a combination of reading independent user reviews across multiple retail platforms (Amazon being a significant source), scrutinising manufacturer claims with an eye towards realistic expectations, and conducting our own observational testing where feasible. This isn't simply about applying a product according to the instructions; we simulate typical UK weather conditions – exposure to rain, fluctuating temperatures, and prolonged sunlight – to truly gauge its resilience and long-term impact. Furthermore, we delve into formulation details: ingredients matter. Some products rely on harsh chemicals that can damage timber over time if not used correctly, while others utilise more environmentally friendly approaches. Understanding the active components allows us to assess potential risks and benefits for both your decking and the surrounding environment. Finally, cost is a crucial factor, but it shouldn’t be the *only* factor. We consider the price per square meter of coverage – a vital metric when dealing with outdoor areas – alongside the expected longevity of the treatment and the effort required to apply it effectively.
The UK presents unique challenges for patio and decking maintenance that are rarely fully appreciated by consumers. Our climate, characterised by frequent rainfall, high humidity, and significant temperature variations, accelerates timber degradation far more rapidly than in drier regions. Decking installed in a south-facing garden will naturally experience greater UV exposure, leading to faster fading and surface damage. Moreover, UK house sizes tend towards the smaller side compared to continental Europe or North America, meaning that even a modestly sized patio can represent a substantial area requiring treatment. This is particularly relevant when considering product coverage rates – a 5-litre bottle might *claim* to cover 50 square metres, but realistically, application will be far more targeted and diluted, especially given the frequent rainfall we experience. Regulatory considerations are also worth noting; while there aren’t specific UK laws dictating which treatments you can use, responsible stewardship of timber resources is encouraged via sustainable forestry practices – choosing products that minimise chemical usage and promote timber longevity aligns with these broader goals. The price points for decking treatments typically fall into three tiers: budget options (around £20-£40) often contain lower concentrations of active ingredients and may require multiple applications; mid-range products (£40-£80) offer a better balance between cost and performance, incorporating more robust formulations and wider coverage claims; and premium treatments (£80+) typically boast highly concentrated formulas, advanced technologies (like slow-release mechanisms), and extended warranties – though the value proposition of these higher costs needs careful scrutiny.
A common mistake UK buyers make is applying products solely based on visual assessment after a single application. Decking cleaning and treatment are rarely ‘set it and forget it’ processes. Mould, algae, and moss thrive in damp conditions, and without ongoing maintenance, they will inevitably return. Regular inspections – ideally twice annually, spring and autumn – are vital to identify early signs of regrowth and apply preventative treatments accordingly. Furthermore, many consumers misunderstand the difference between cleaning and treating. Cleaning focuses on removing existing surface contaminants, whereas treatment aims to penetrate the timber and provide long-term protection against future attacks. Simply wiping down a mouldy deck with soapy water offers only temporary relief; you need an active ingredient that actively inhibits fungal growth. Another prevalent error is over-application. Diluting the product excessively to achieve "better penetration" often renders it less effective, as insufficient active ingredients remain to combat the underlying problem. Always follow manufacturer’s instructions precisely – this isn't just about adhering to a timetable; it's about ensuring optimal performance.
The Ronseal Decking Cleaner & Reviver leans towards a more traditional approach. Its effectiveness stems from a potent blend of solvents and surfactants designed to dissolve mould, algae, and dirt. It’s particularly well-suited for heavily soiled or stained decks where a deep clean is required before applying any protective treatment. However, its relatively high solvent content can be harsh on some timber types, potentially causing slight surface darkening over time if not used judiciously. The Reviver component – designed to infuse the timber with protective oils – provides a degree of longevity but won’t offer the same level of resistance as products utilising slower-release technologies. It's generally considered a good choice for decks made from pressure-treated softwood, offering robust cleaning power at a competitive price.
The Wet & Forget Rapid Action Outdoor Treatment takes a fundamentally different tack, employing a slow-release formulation that delivers active ingredients directly to the timber over an extended period. This method is particularly beneficial in our damp UK climate, providing sustained protection against mould and algae without requiring frequent reapplication – although it’s crucial to understand this isn't a 'maintenance free' solution; periodic inspection and light cleaning are still recommended. The product's polymer-based delivery system ensures consistent distribution, minimising the risk of uneven application and maximising coverage. It is formulated for a wider range of timber types than the Ronseal product, including hardwoods, although rigorous testing on specific hardwoods is always advisable prior to widespread use. While its longer-lasting protection represents a significant advantage in terms of convenience, it does come with a higher initial investment.
Ultimately, the ‘better’ patio and decking treatment depends heavily on your individual circumstances and priorities. If you're dealing with a heavily soiled deck made from softwood and prioritise immediate cleaning power at a lower cost, the Ronseal Decking Cleaner & Reviver represents a solid choice. Conversely, if you value convenience, sustained protection against mould and algae in our damp climate, and are willing to invest slightly more upfront, the Wet & Forget Rapid Action Outdoor Treatment offers superior long-term performance. Careful consideration of your decking material, existing conditions, and your willingness to commit to ongoing maintenance will guide your decision effectively.
Don’t forget that both products rely on appropriate application techniques for optimal results – following manufacturer guidelines precisely is paramount. Regular inspection and preventative treatment are essential regardless of the product you choose; this isn't a one-off solution but rather an ongoing commitment to preserving the beauty and longevity of your outdoor space.