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GreenBlade

Outdoor Algae Remover for Patios, Decking, Fencing & Artificial Grass

Remove Green Growth Before It Takes Over

Algae, mould and lichen thrive in the damp conditions found across British gardens. Winter Guard gives you one simple treatment for unwanted green growth across patios, decking, fencing, artificial grass and other suitable outdoor surfaces.

UK MANUFACTURED

CHILD & PET FRIENDLY

MULTI-SURFACE

CONTROLS ALGAE & LICHEN

What Is the Best Way to Remove Green Algae From Outdoor Surfaces?

Green algae commonly develops where outdoor surfaces remain damp, shaded or exposed to prolonged wet weather. An outdoor algae treatment such as GreenBlade Winter Guard is designed to tackle algae stains, green film, mould and lichen while helping inhibit regrowth across suitable garden surfaces.

Winter Guard can be used as part of a wider garden maintenance routine across areas including:

Instead of buying a different cleaner every time green growth appears elsewhere in the garden, Winter Guard provides a single treatment for multiple affected areas.

Why Does My Patio Keep Turning Green?

That green coating appearing across paving isn’t simply dirt.

Dampness, limited sunlight, organic debris and the UK’s wet climate create ideal conditions for algae, moss, mould and lichen to develop across exterior surfaces.

It tends to become particularly noticeable:

  • during autumn and winter
  • in shaded areas
  • following prolonged rain
  • beneath garden furniture
  • around fencing and walls
  • between paving joints
  • on areas with limited airflow

Cleaning the surface removes the visible problem, but regular outdoor maintenance can help stop green growth from becoming established again.

Patio Algae Remover

Patios are particularly vulnerable to green algae during wet weather. Winter Guard is designed to tackle algae staining and green film on suitable patio and paving surfaces.

Decking Algae Cleaner

Shaded and damp decking can quickly develop unwanted green growth. Treat affected areas with Winter Guard according to the product directions to restore a cleaner-looking surface.

Fence Algae & Green Growth Remover

Green growth across fencing can leave even a well-kept garden looking tired. Winter Guard helps tackle algae, mould and lichen on suitable outdoor fencing.

Artificial Grass Algae Treatment

Artificial grass can also develop algae and organic growth during damp periods. Winter Guard gives artificial lawns a seasonal cleaning treatment alongside the wider garden.

Meet Winter Guard

One Treatment. Your Whole Garden.

GreenBlade Winter Guard

Garden and Patio Algae Remover

Starting from £24.99

 

GreenBlade Winter Guard was developed as an advanced algae stain and green film remover for seasonal outdoor maintenance.

Its multi-surface approach means you can move beyond treating one isolated patio slab and instead tackle unwanted green growth throughout the garden.

Controls mould, algae & lichen

Designed to tackle the organic growth that causes green staining across outdoor surfaces.

Helps inhibit regrowth

Winter Guard doesn’t simply form part of the clean — it has been developed to help control recurring growth.

Use across your outdoor space

Treat suitable patios, fencing, decking, artificial grass and garden surfaces.

Child & pet friendly

Developed with real family gardens in mind.

Eliminates 99.9% of odours at the source

Winter Guard also helps tackle unwanted outdoor odours as part of the treatment.

One Cleaner Instead of a Shed Full of Products

Cleaning Problem
Typical specialist cleaner
Winter Guard
Patio algae
Patio Cleaner
Decking green growth
Decking Cleaner
Fence algae
Exterior Cleaner
Artificial grass algae
Artificial Grass Treatment
Mould & lichen
Specialist Treatment
Seasonal green film
Outdoor Cleaner

Simplify Your Garden Cleaning Routine

Instead of treating the garden as a collection of separate surfaces, Winter Guard lets you tackle the common problem affecting them all: unwanted organic growth caused by damp outdoor conditions.

How to Remove Algae With Winter Guard

01

Prepare

Remove loose leaves, debris and heavy surface material from the area being treated.

02

Apply

Prepare and apply Winter Guard according to the dilution and application instructions supplied with the product.

03

Treat

Ensure the affected surface receives even coverage and allow Winter Guard to work according to the label directions.

04

Maintain

Inspect outdoor areas periodically and treat recurring green growth before it becomes heavily established.

Why Does Algae Keep Coming Back?

Removing algae doesn’t change the conditions that caused it.

If an area remains damp, shaded and exposed to organic debris, green growth may eventually return.

This is why patios beside fencing, north-facing paving, areas beneath garden furniture and sections of decking receiving little sunlight can repeatedly develop algae.

Regular maintenance is usually easier than waiting until an entire surface has become heavily affected.

Winter Guard has therefore been designed not simply as a one-off patio cleaning product, but as part of an ongoing outdoor garden maintenance routine.

Do I Need to Pressure Wash My Patio?

Not every instance of algae requires reaching immediately for a pressure washer.
Pressure washing can be useful for some surfaces and contamination, but the appropriate cleaning method depends on the material, condition of the surface and type of growth present.
For algae, mould, lichen and green film, using a purpose-developed outdoor treatment allows you to target the organic growth itself.
Always follow the instructions for the treatment and the manufacturer guidance for the surface being cleaned.
This can capture some of the crossover from searches around pressure-washing patio cleaning without attempting to rank the page primarily for pressure washers.

Looking for a Child & Pet Friendly Garden Cleaner?

Outdoor cleaning products are frequently used in exactly the same places where families and pets spend their time.

Winter Guard has been developed as a child and pet friendly garden cleaning treatment when used according to its instructions.

As with any cleaning product, always follow the label, application guidance and safety information carefully.

Frequently Asked Questions

What removes green algae from patios?

A dedicated outdoor algae treatment is designed specifically to tackle green algae and organic surface growth. GreenBlade Winter Guard is formulated to control algae, mould and lichen across suitable patios and other outdoor garden surfaces.

Algae thrives in damp conditions, particularly on shaded surfaces that receive limited sunlight or airflow. Wet autumn and winter weather can therefore make patio algae much more noticeable in UK gardens.

Winter Guard is intended for use across suitable garden surfaces including decking. Always check the product directions and surface suitability before treatment.

Yes. Artificial grass can develop algae and other organic growth, particularly in damp or shaded conditions. Winter Guard can be used as part of seasonal artificial-grass maintenance according to its application instructions.

Winter Guard is formulated to control mould, algae and lichen and to help inhibit regrowth.

Winter Guard has been developed to inhibit regrowth. However, outdoor conditions such as moisture, shade and organic debris mean ongoing garden maintenance may still be required.

Winter Guard can be used on suitable outdoor garden surfaces including fencing. Check the product directions and test delicate or coated surfaces where appropriate.

Winter Guard is marketed as child and pet friendly. Always use it according to the supplied directions and observe the safety guidance on the product label.

No. Moss and algae are different types of growth, although both commonly appear in damp outdoor environments and can occur on the same patios, paving and garden surfaces.

Treatment conditions depend on the product being used. Check the Winter Guard instructions and weather guidance before application rather than applying during unsuitable weather.

Trusted in Real British Gardens

Posted on Amazon Amazon
Reviews192 profile picture
8 days ago
Verified
Fresh enzyme cleaner that removes pet odours from artificial grass This cleaner has a fresh scent and uses enzymes to break down odours effectively, especially in areas used by dogs. It sprays evenly and rinses away cleanly without leaving residue or dulling the grass.It’s ideal for keeping artificial lawns hygienic and fresh, and it noticeably reduces pet smells after just one use. A reliable cleaner that helps maintain a bright, clean outdoor space.
Posted on Amazon Amazon
MarkS profile picture
44 days ago
Verified
Working well in initial testsWorking well in initial tests This is a little on the pricey side for the amount you get but it does dilute quite a lot so goes a reasonable way.Easy to use by just adding it to water and pouring it over with a watering can.It smells nice but that doesn't last too long or get overpowering which I feel is a good thing.It does seem to lean although my major test is yet to come at a holiday home so should there be any issues I will update this review.Seems good quality and cleans well so hoping for good results when I treat a much larger area.
Posted on Amazon Amazon
Vinereviewer1979 profile picture
52 days ago
Verified
AstroTurf cleaner Minty scented. Easy to use and dilute to desired strength.The upper end of the price for the quantity you receive - I diluted this with a 1 part liquid 5 parts water and I could smell the fragrance for a few hours but with the hot weather the urine smells promptly came back. Have used almost the whole bottle over two applications so it's quite expensive but for smaller areas may last longer
Posted on Amazon Amazon
Ews profile picture
Ews
52 days ago
Verified
GreenBlade Green Guard Artificial Grass Cleaner & Odour Remover, 1L 1 Pack My ExperienceRight, morning everyone! Now, if you keep dogs, you know the struggle in winter or when it’s absolutely tipping it down outside—the ruddy dogs only want to go out if you give them a gentle little nudge on the end of your foot (only joking, of course, just a little budge with the boot!). Because of that, I set up a dedicated patch of astroturf for them near the house so they can do their business quickly without getting bogged down in the mud. It works smashingly well, but the smell gets right on your nerves!And I’ve got to say, this stuff is proper job!What I really like is the thick gel consistency. Unlike all sorts of other watery cleaners I’ve used in the past that just wash away in a flash, this gel actually feels like it’s clinging right to the "blades" of grass and backing so the bio-enzymes can get to work. I’ve used it on the main path as well as the astroturf patch, and it works equally well on both. It definitely removes the lingering wee smell completely rather than just masking it, leaving behind a nice fresh Watermelon Breeze scent. Ideal bit of kit for keeping the yard smelling fresh!The ProductThe GreenBlade Green Guard Artificial Grass Cleaner & Odour Remover (1L Bottle). Made in the UK, featuring a thick probiotic bio-enzyme gel formula with a Watermelon Breeze fragrance. Specifically engineered to cling to artificial turf fibers on hard-standing bases (concrete, patios, decking) to eliminate dog urine and pet odors at the source. Safe for pets and children once dry.The Ideal User / Deal BreakerAn essential buy for dog owners, pet keepers, and homeowners who have artificial grass laid over hard surfaces like concrete or patios and need a thick cleaner that won't immediately drain away. The deal breaker is if you need a pre-attached hose-end spray bottle for a massive multi-acre field, as this concentrated gel requires manual dilution in a watering can or sprayer.SummaryA remarkably effective, thick probiotic gel cleaner that clings where it's needed and completely neutralises stubborn pet odours. It does a fantastic job keeping the dog patch and path fresh, keeps the yard setup running smoothly, and gets 5 stars from me!Star Rating: 5/5
Posted on Amazon Amazon
Reviews192 profile picture
60 days ago
Verified
Fresh effective cleaner that removes odours from artificial grass This cleaner has a fresh scent and works well on artificial grass, especially in areas used by pets. It removes odours effectively and leaves the surface looking cleaner without residue.The area cover depends on what surface you have under the artificial grass, if it’s concrete it’s a much smaller ratio so doesn’t cover as much area. I have a small courtyard and had to buy another bottle to get the proper coverage. It is overall a helpful product for keeping artificial grass fresh.
Posted on Amazon Amazon
Rygel XVI profile picture
62 days ago
Verified
Very effective - nice smelling too I’m a recent convert to the world of artificial grass, having been inspired by a neighbour who got a patch for her dog to use. Our back garden is all stone flags and raised beds so it’s not welcoming for our little dog when she needs to answer a call of nature at short notice. In most cases our regular walks are enough for her needs, but occasionally she needs to go outside and it just won’t wait. Artificial grass is the answer to that problem and this cleaner is the solution to the problem that arises afterwards.It’s more than just a general cleaner that uses an anti-surfactant to remove dirt, although it does have that element. In this product there’s an enzymatic element that breaks down the stuff that causes odours: that detritus has attached itself to the inner pile of the artificial grass and as it decays it produces the odour. This cleaner helps to break that down rather than just trying to release it so it can be washed away.It really does work well and I’ve found it best to use it last thing at night and let it sit until morning. There’s a fresh odour that adds to the general feeling of cleanliness and makes the grass much more pleasant to be around.It’s not cheap so you’ll have to make up your own mind about whether it’s good value for money. I can say that it definitely works though, and perhaps that effectiveness is worth paying for.
Posted on Amazon Amazon
Kev profile picture
Kev
62 days ago
Verified
Really Handy for Keeping Our Artificial Grass Fresh. I bought this because we have artificial grass and, with having a dog, it can get a bit smelly, especially when the weather is warm. I wanted something that would help get rid of the smell without using anything too harsh.I've been really happy with this so far. It's a thick gel, so it doesn't just disappear into the grass as soon as you put it down. It's easy to spread around and doesn't make a huge mess while you're using it.The main reason I bought it was for the dog urine smell, and it has definitely helped. After using it, the grass smells much fresher and the usual doggy smell is noticeably reduced.I also like that it doesn't have that really strong chemical smell that you get with some outdoor cleaners. The 1-litre bottle is a good size too, and I think it should last me quite a while.I've also used a bit on the patio where the dog tends to walk after going outside, and it's been useful there as well.Overall, I'm really pleased with it. It's easy to use, doesn't smell harsh and has made a noticeable difference to keeping our artificial grass smelling fresh. It's definitely something I'll keep using, especially during the warmer months.
Posted on Amazon Amazon
Amazon Customer profile picture
64 days ago
Verified
Leaves a nice smell GreenBlade Active Max Artificial Grass Cleaner for Dogs is a useful solution for keeping artificial grass fresh, clean and more pleasant around pets. The bio-enzymatic formula is designed to tackle dog urine odours rather than simply covering them up, making it particularly suitable for areas that are regularly used by dogs. The Cool Mint scent leaves a fresh fragrance after application without being excessively overpowering.The 1L bottle provides a reasonable amount of cleaner, especially because it can be diluted at a 1:5 ratio. This makes it practical for treating larger areas of artificial grass while keeping usage economical. The cleaner is straightforward to incorporate into a regular garden cleaning routine and can help maintain a fresher-looking and better-smelling lawn.The product is especially convenient for households where artificial grass receives frequent use from dogs, as unpleasant smells can otherwise become noticeable during warmer weather. The mint fragrance gives the grass a clean, refreshed feel after treatment. Overall, GreenBlade Active Max combines odour control, a pleasant scent and a concentrated formula in a convenient 1L bottle, making it a practical artificial grass cleaner for dog owners looking to keep outdoor areas hygienic and fresh.
Posted on Amazon Amazon
B profile picture
B
76 days ago
Verified
Safe, UK-made gel for artificial grass and patios If you’ve ever spent a summer wondering if your garden is a dog loo in disguise, this GreenBlade Green Guard cleaner is a bit of a revelation for artificial grass and patios. I picked up the 1L bottle after trying a few “fresh scent” sprays that just left the lawn smelling like a perfumed kennel. This one’s a thick probiotic gel, which means it actually breaks down the source of the pong rather than just layering on a fragrance. The science bit is simple: good bacteria munch away at the nasties, so you’re left with genuinely neutral grass, not a chemical cloud.I used it neat on the worst patches (thanks, spaniel) and diluted for a general spruce-up. The instructions are a bit vague on ratios, so I played it by ear, but it worked well both ways. The lack of a strong scent after use was a surprise – it doesn’t leave your garden smelling like a lemon grove, but it does mean you know the odour’s actually gone, not just hidden. The 1L bottle covered my small lawn and a couple of high-traffic patio spots, but if you’ve got a big garden or a pack of dogs, you’ll probably need more than one bottle for a deep clean.What I hadn’t expected was how safe it felt to use – no gloves needed, and I didn’t worry about the kids or the dog rolling around straight after. It’s UK-made, which is a quiet reassurance if you’re fussy about what goes on your grass. The gel consistency means it clings to the blades rather than running straight off, but it does take a bit longer to rinse out of a watering can than a thin liquid. For anyone with a shared garden or a communal play area, it’s a relief to know you’re not leaving behind anything harsh or toxic.One thing to keep in mind: there’s no lingering “clean” smell, so if you’re after that just-mown fragrance, you’ll be disappointed. Also, the lack of detailed dilution guidance means you might use more than you need at first, which could get pricey if you’re treating a large area regularly. Cleaning up is easy – just a quick brush and rinse before applying – but the bottle does get a bit sticky if you’re not careful with the cap.For the price, it’s good value for small to medium lawns, especially if you’re fed up with chemical sprays that don’t actually solve the problem. If you’ve got a massive garden or want a strong scent, you might want to look elsewhere, but for most pet owners, this is a practical, genuinely effective fix. 4 stars – it does what it promises, is safe for the whole family, and finally lets you enjoy the garden again without holding your nose.
Posted on Google Google
Caroline Kennedy profile picture
79 days ago
Trustindex verifies that the original source of the review is Google.
Our artificial grass was looking a bit tired and we weren’t sure what to do with it as it’s in a commercial setting in our pub restaurant premises so has a lot of footfall, spilt food and drinks. My friend recommended giving Green Blade Cleanse a call and I’m so glad I did. They recommended using a product called cleanse and what can I say! It looks like it’s just been laid and it smells amazing.

Stop Green Growth Taking Over Your Garden

From a green patio to algae across the decking, fencing and artificial grass, the same damp conditions can affect your entire outdoor space.

Deal with the problem using one dedicated garden treatment.

 

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