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5L Simply Spray & Walk Away Moss, Mould & Algae Remover for Patios and Decking

£12.49 exc VAT
£14.99 inc VAT

5L Simply Spray & Walk Away Moss, Mould & Algae Remover for Patios and Decking

Over 100,000 bottles sold | 1 bottle sold every 13 minutes

Quick code: 229020

55 reviews
£12.49 exc VAT
£14.99 inc VAT

Free delivery on this product*

Order now for delivery 21 March

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  • Warranty: Not applicable
  • 30 day money-back guarantee
  • Have a question? Call 0800 091 3171

Product information

Brand - Simply Spray

5L of Pro-Kleen Simply Spray & Walk Away

Also available in 10L, 15L and 20L!

Not only is moss unsightly, it can also create danger on outdoor floors with its slick and slippery surface. Pro-Kleen Simply Spray & Walk Away is a multi-purpose anti-bacterial disinfectant for the easy treatment, removal and prevention of moss, mould and algae on hard surfaces! It's formulated for use on patios, fencing and decking. It's even suitable for roofs, uPVC windows, boats, caravans, motor homes, sheds, decking and driveways and most outdoor surfaces where green mould, algae or moss is present.

Why choose Pro-Kleen Simply Spray & Walk Away?


We have sold over 100,000 bottles in the UK and 1 bottle is sold every 13 minutes. This just proves how amazing it really is!


A 5L bottle of Simply Spray & Walk Away makes a minimum of 25L of solution covering a HUGE 200m² area!Simply Spray & Walk Away is a maximum strength super concentrate boasting 75% more active ingredient than other brands! This solution can also be diluted to make up to 50L of solution at 1:9 dilution.


The dilution rate is 1L solution to 4L of water. A little goes a VERY long way! Apply in dry conditions avoid applying when rain is forecast within the following 8 hours summer apply late afternoon / early evening (when sunlight is less intense) The solution can be applied up to a massive dilution rate of 5L solution to 45L of water for less affected areas, which would cover a huge 400m² area. TIP: The less dilution the quicker the results.


Perfect for use on patios, decking, fencing, paths, driveways, roofs, sheds, greenhouses, garden statues, terracotta pots, UPVC windows, boats, caravans, motor homes and all indoor & outdoor hard surfaces affected by moss, mould and algae!


Once treated results will show in 2-3 days! Simply Spray & Walk Away penetrates your outdoor surfaces creating an invisible barrier which will help to prevent re-growth for up to 6 MONTHS!

100% SAFE

Biodegradable. PH8. Non-caustic, no acid & no bleach! Simply Spray & Walk Away is safe for use around children & pets once the area is dry.

How do I use it?

Read the instructions on the bottle carefully, then simply decide your required dilution and apply with watering can or pump sprayer and apply the solution to the entire area.

Why does moss appear?

Moss often appears on hard surfaces in shady and moist environments. It may be more noticeable after a wet spell or during winter but is present year-round. Moisture allows moss to grow and reproduce. Under the right conditions, it can quickly take over a patio surface. 

If you have a problem with moss on grass, then use Pro-Kleen Iron Sulphate which also greens grass and hardens turf.


Rating 5 out of 5 based on 55 reviews.
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Showing 1 to 5 of 55 Reviews
Reginald Dean
Quick action, reasonable price.
3 Oct 2017
John Dart
The product is very effective
27 Jun 2017
Mary p
does what it says excellent
24 May 2017
Janusz Kaczmarczyk
Very good product work very quickly
24 May 2017
This really kills green algae even diluted to the recommended extent. Best product I've tried.
23 May 2017

Documents & Instructions

Frequently asked questions

What are the active ingredients of 'mylek simply spray' patio cleaner? it isn't listed.
This product contains Benzyl Chloride which is an organic compound.
Can you tell me the percentage concentration of benzalkonium chloride in your mould and algae killer.
The percentage concentration is 9.5%.
Can I use on my roof tiles
This product can be recommended to be used on roof tiles.
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 this product can be used on UPVC and conservatories?
Yes you can use this product on UPVC and conservatories.
can you use Simply spray, on boat canopies (not pvc style but material type
This product can be used on your boat canopy.
can i use this on liverwort?
This would not be effective on liverwort. We would recommend a weedkiller to get rid of this weed.
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.

Just purchased this product. About to use this on our fence before painting with cuprinol type preservative. How should I leave before painting.
We would advise you to leave a period of two weeks before painting the fence.
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.
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.
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.
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.
Can it be used on tarmac? Can it be used more concentrated than the recommended ratio of 1:4, for exemple 1:2 on very stubborn moss
Yes, you can apply it at a more concentrated ratio.
Do u have to hose it down after a couple of days
No, you do not need to hose down after a couple of days. Simply brush away any dead moss, if needed.
Is this safe to use on York stone paving
Yes, this product is safe to use on York stone.
I've been asked to buy a moss and algae killer but they said it must specifically say good to use on brick paving. I noticed it's not spacific in its surfaces so could you confirm if it's ok to use on this surface. It's peace of mind before I buy.
This is perfect for use on block paving so yes absolutely the right choice.
Yes, it would be suitable for your composite decking. However, it will not get rid of stains. It is a mould, moss and algae remover, not a stain remover.
I have artificial turf,if this went on it would it damage/discolour it?
This product is safe to use on artificial grass.
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.
Can this be used on a pebbledash wall?
Yes, this can be used on a pebbledash wall.
Can this be used on a flat fibreglass roof?
Yes, this should be suitable to use of a flat fibreglass roof.
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 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.
My house was insulated about 3 years ago then covered in a water proof coating in white it has just started to turn green in certain areas will this product remove the build up?
If the green build up is moss, mould or algae, then this product will remove it.
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 have used this on slabs how long does it take for white stains to go away as I used it about 4 days ago and they are still there
If the product is applied at the recommended dilution rate of 1L of solution to 4L of water, there should be no white stains left. Avoid applying in direct sunlight, or if frost or rain is imminent.
I already asked about white marks on slabs and was told this is normal and they will disappear I am now being told there should be no white marks ?
We are not aware that white marks are normal. If the slabs have white marks on them, it may be that the product has not been shaken prior to use, or if it has been used when frost is present.
Can this product be used on basket weave garden furniture, to clear green algae? And best way to apply?
Yes, the product  can be used on basket weave garden furniture, and will remove green algae. Dilute 1L of solution to 4L of water, and spray directly onto the algae on the furniture.
Is this product suitable for resin bound driveways?
Yes it is safe to use on this surface
Would this product remove and prevent lichen/moss growth on internal damp sandstone cellar walls?
We would recommend using neat for Lichen or using our Utima Plus XP Moss killer which is stronger but yes it will
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