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5L Simply Spray & Walk Away Patio Cleaner
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Product information
Specifications
Brand:
Pro-Kleen
Weight:
5-21 kg
Capacity:
5 L
Powerful Patio Cleaner
With over 250,000 bottles sold in the UK, Simply Spray & Walk Away is a top choice for tackling green mould and algae. It quickly clears slippery growths on patios, paths, and decking, while removing dirt and grime - revitalising your garden.
Kills Green Mould and Algae
Say goodbye to slippery surfaces! This powerful formula kills green mould and algae, making them easy to rinse or brush away.
Stops Regrowth
This formula creates a protection barrier that will protect against the re-growth of mould and algae for up to 6 months.
Easy to Use
Just dilute, spray, and leave it to work—no pressure washer needed! After 2-3 days, rinse off for a bright, clean patio.
Long-Lasting
A 5L bottle makes 25L of solution, covering up to 200m². Multi-pack discounts are available for even better value.
Versatile
Works on patios, paths, decking, fences, tarmac, glass, roofing felt, PVC, and more—even boat hulls and caravans!
Bleach-Free & Pet-Safe
Biodegradable, bleach-free, and pH neutral. This formula is safe for pets and children once dry - this makes it the perfect choice for family homes.
How to Use
- Dilute 1 part solution with 4 parts water (use neat for tough areas).
- Apply with a sprayer or watering can.
- Keep pets and children away until dry.
- In 2-3 days, green growth turns orange or brown—then rinse or brush clean.
Contains: Alkyl (C12-16) Dimethyl Benzyl Ammonium Chloride and Didecyl Dimethyl Ammonium Chloride.
Always read the label and use pesticides responsibly.
Reviews
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Christhine Holtby
Brilliant used it before does exactly what it says
16 Feb 2025
Sally Belton
Fantastic product
22 Oct 2024
Anonymous
Spray and walk away is fantastic it does what i says on the bottle have used many times with great results
27 Aug 2024
Mrs heather Faux
Brilliant cleaning g productive
21 Aug 2024
Bryn Priddle
Works great.
26 Jun 2024
Beck whitehead
Awesome. The fence looks brand new. I didn’t realise how green with algae it was until after using this product
23 Jun 2024
Alex Parker
Great product
27 May 2024
DP
Does exactly as described
21 May 2024
Brian Middler
This is great stuff one spray at 4 to 1 cleaned up my whole patio and garage wall brilliant
21 May 2024
Robin Ainsworth
Used for a few years. Best value. Smells OK, not nasty chlorine. It's biodegradable
17 May 2024
Amazon Customers
2994 Amazon customers reviewed this product
Customer Questions
Can I use the product to remove green algae on a painted wooden fence without damaging the paint?
Yes, but we always recommend testing a small inconspicuous area first and also checking the label on your fence paint. This is not suitable for plywood.
Is this OK to use on YORK STONE?
Yes, this product is safe to use on York stone. But we always recommend testing a small inconspicuous area first.
Can this be used to on house walls prior to painting with Sandtex
Yes, it can be used on house walls prior to painting. once the green mould & algae disappear and the wall is dry then the Sandtex can be applied.
I have a rendered gable end wall with plants and lawn underneath, it painted with sandtex smooth masonry paint.
I have algae that has appeared, I want to paint on simply spray and leave it if possible and repaint the wall. Is this ok.
Yes, but we always recommend testing a small inconspicuous area first.
My decking goes right up to my fur trees , will this damage the roots if it leaks off the decking ?
Please try to rinse away from your fir trees. But if it leaks onto the roots just rinse well to stop any damage.
Can this be used on gravestones
Yes, this can be used on gravestones. Always follow the label instructions.
I have a balcony terrace where paving slabs are on pedestals over a Bitumen base. Is the product safe to use with Bitumen?
Yes, it is safe to be used with bitumen.
Can this be used on eco render with it being a silicone based render
Yes, but please test a small inconspicuous area first.
Hi. I used this product on a resin pathway. It was dry the day i done it but rained the next day. Will it have worked or do i need to do it again?
No, It will take a few days to a week for the green mould & algae growth to change to brown. Then rinse or brush away.
I purchased the green mould and algae remover a few months ago. What guidance is there on temperature? Will it work in cold condition ie. February or do I need to wait a couple of months?
No, apply on a dry day with no frost or when rain is due for 24 hours. For better results apply in spring or warmer temperatures below 20 degrees.
Can this be used on porcelain light grey tiles
Yes, but we always recommend testing a small inconspicuous area first.
Can this be used to eradicate the mold growth/moss on the "exterior of my car? Thanks!
No, this is not tested for use on cars it could dull your paint work. We would recommend washing your car.
Will this work on white cotswold stones that have turned green?
Yes, but we always recommend testing a small inconspicuous area first.
I see this is harmful to aquatic life. I wanted to use it on the deck of my boat which is on a pontoon. Is this still toxic once it has dried say after 24 hours, and rain then falls to rinse the deck? Is there any period after which it loses such toxicity?
This product is dangerous to aquatic life, so avoid entering waterways.
Hi can spray and walk away be used on black lime stone slate and is it safe near artificial grass
We always recommend to test a small inconspicuous area first. It should not damage the artificial grass depending on the quality.
Which product is best for killing off moss growth on block paved drives?
Yes, this is the product required to remove moss from your block paved drives. Please follow the label instructions.
Can I use this product on my flint gravel which has turned Green in shaded places.
Please test on a small inconspicuous area first.
Can this be used on tarmac drive as moss growth under trees are a problem
This can be used on a tarmac drive. On application the severe moss can also be agitated with a brush. Once the moss turns brown within 2-3 days this can be brushed away.
Can I use it on a Hoggin path, if so how do I gen rid of the brown deposit left behind from the dead algae?
No. The dead brown algae can be brushed away.
Is this product suitable for use on bare timber, plywood etc?
This product can be used on natural timber. However, we would not recommend it to be used on plywood as it may distort the layers.
Can Pro Kleen Simply Spray and Walk Away be used in Indian stone paving slabs? You say it can be used on all ‘hard surfaces’, but I have been advised that Indian stone is too soft?
The manufacturer advises that this product should not discolour the Indian Sandstone. However, we would recommend you to test a small area first.
Does this product discolour or adversely affect Indian Sandstone patios?
This product should not discolour the Indian Sandstone. However, we would recommend you to test a small area first.
Do you have a product that will get rid of black lichen spots on my stone patio
We would recommend the Ultima Plus XP but use a stronger dilution rate, and in thicker clumps, it can be applied neat. (Do not allow run off onto lawns or planted borders, as this product will cause damage).
Can this product be used to remove green mould from a tarmac driveway
This can be used on a tarmac drive and will remove the green mould.
Is this product suitable for resin bound driveways?
Yes it is safe to use on this surface
Can this be used on rendered walls?
Yes, but you can always test on an inconspicuous area first.
We don’t have any pets, but our neighbours have 3 cats, all frequent visitors to our garden. What would happen if one of them walked on the patio before it dried and then licked their paws?
This product contains benzyl alkyldimethyl chloride and once dry is safe for cats and pets to walk on the treated area. You could advise your neighbours you will be using the product and to keep the cats inside or to wash their paws on return.
I have a concrete patio which has been painted, can I use this on a painted surface?
Yes, you can use this product on a painted surface.
Can dogs walk on the slabs after spraying it on
Once the spray has dried into the surface then your dogs can walk on the slabs.
Can it be used near a fish pond
If the solution gets into your pond it will kill all the aquatic life.
Hello,
Is this product safe and effective to use on g.r.p.surface of a boat, and also the canvas area of the boat.
Thankyou.
M H Oakland
This product can be used on your boat canopy, but only if the boat is dry docked (on dry land), as this product is harmful to aquatic life, so avoid entering waterways.
Can this be used on solar panels
Yes, but always test a small inconspicuous are first.
Will this kill moss in my monobloc driveway?
Yes, but please always test a small inconspicuous area first.
We have lots of white lichen spots on our roof. Can this product be used to clean the roof and remove these spots?
No, this is not suitable.
We would recommend on using a Roof Cleaner linked below
https://www.hygienesuppliesdirect.com/roof-cleaner
We would recommend on using a Roof Cleaner linked below
https://www.hygienesuppliesdirect.com/roof-cleaner
Can this be used on composite decking?
Yes, it would be suitable for your composite decking.
Can you use Simply spray, on boat canopies (not pvc style but material type
Jenny
This product can be used on your boat canopy, but only if the boat is dry docked (on dry land), as this product is harmful to aquatic life, so avoid entering waterways.
Hi, can you tell me the percentage concentration of benzalkonium chloride in your mould and algae killer. Thanks,
John Anderson
The percentage concentration is 1 - 10%.
Will this discolour red block pavin and can my dog walk on it after.
No it will not and yes you can once it is dried and soaked in.
Can the ‘ProKleen Simply Spray and Walk Away’ product work with the ProKleen 10 year sealer on Indian Sandstone or will it remove the sealer ? Please can you email me your response. Many thanks
This product should not discolour the Indian Sandstone. However, we would recommend you to test a small area first. Please use at a 4:1 ratio.
Will this clean black streaks from a rendered wall? I know it will clean the green algae but unsure of the black.
No, this is designed for moss, mould and algae. You can always test a small inconspicuous area on the black streaks.
Does this work on a glass conservatory roof ?
Yes, this will work on a glass conservatory roof, but we would advise not to use if the run-off goes into drains that flow to natural waterways, as the product is dangerous to aquatic life.
Is this safe to use on York stone paving
Yes, this product is safe to use on York stone.
Can this be used on greenhouse glass
It can be used on greenhouse glass, but we would advise you that if the run off comes into contact with grass or plants, it will damage them.
Hello, is the Simply Spray & Walk Away safe for use on bituminous flat roofing felt?
This is safe to use on Bitumen Flat Roofing Felt.
Will this kill grass if accidentally oversprayed?
This product would yellow the grass if it is allowed to spill over onto it. To avoid this, we would advise you not to allow overspill onto any grassed areas or flowering borders.
If any runoff finds it way into a septic tank will it affect the microbes in it?
Be extra careful when rinsing off near your septic tank, it should not affect the microbes unless poured into the septic tank. This is not advisable.
Can this be used on my soft top roof please?
Yes it can thank you
Is this product suitable for use on an extension flat roof with the usual felt type material
This product can be recommended to be used on felt roof.
Your product and another leading brand have the same ingredients at the same percentage. Can I assume these two items are identical in their results but yours is better priced?
This is match to the maximum allowed ingredients by health & safety guidlines.
Can this product can be used on UPVC and conservatories?
Yes you can use this product on UPVC and conservatories.
You state that Pro-Kleen can be used on UPVC conservatories.
Can you confirm that it can be safely used on the Polycarbonate Roof of a conservatory without any damaging affects?
As far as we are aware the solution is fine on polycarbonate roofs but as always we recommend testing on a small inconspicuous area.
Can this be used on a pebbledash wall?
Yes, this can be used on a pebbledash wall.
Please tell me the number between 1 and 10 percent benzyl alkyldimethyl chloride. Please tell me the percentage benzyl alkyldimethyl chloride for the ready to use version as a single number. This is my fourth attempt to get this question answered. You kindly gave me the number for the concentrated version. Thank you.
The percentage concentration is 1 - 10% for the benzyl alkyldimethyl chloride in the Simply Spray and Walk Away and also in the ready to use version are the same.
Is this pet safe?, ie, can dogs safely roam in a garden after this has been used.
Yes once it is dry and soaked in
I've just bought the Pro-Kleen Patio/Fencing/Decking Algae Remover product from you. I've got two cats and I've noted that you specifically mention that the product should be allowed to dry off after application, before letting pets back into the garden.
Once the initial application has dried and treated the moss after two to three days, then any rainfall after that would not re-activate the product. If it rains within this time, we would advise you to retreat the area and make sure the new application is dry before allowing pets around.
Does the surface need to be dry before use
Apply in dry conditions avoid applying when rain is forecast for the best results.
Hi thanks for the answer re not applying when rain is forecast. But should the surface to be treated be dry before application
For best results please apply in dry conditions.
Can this product (patio cleaner) be used where the run off may enter a pond with various flora and fauna?
This product cannot be used where the run off may enter a pond with various flora and fauna. It is not advisable to use if the run off is on to a lawn or flower borders either, as it may cause damage.
Can I use on my roof tiles
This product can be recommended to be used on roof tiles.
Can this be used on a flat fibreglass roof?
Yes, this should be suitable to use of a flat fibreglass roof.
I have artificial turf,if this went on it would it damage/discolour it?
This product is safe to use on artificial grass.
Hi, Will the Green Mould & Algae Killer kill any plants that are sprayed? I have some climbing plants growing on the fence I want to treat with this product and I cannot move them off it.
No, this is not safe to use near your climbing plants. It may cause damage.
Is the cleaner safe for use on Concrete imprint drives that have been sealed?
Yes, but please test a small inconspicuous area first.
Ask one of our experts!
We aim to answer all questions as soon as possible - often within a few hours! Although please bear in mind that during busier periods it may take up to 48 hours to receive a response. We look forward to hearing from you.
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