Ronseal High Performance Decking Cleaner Sachets

  4.6/5.0 (55 reviews)
1 coat = Usually sufficient
Total: enter area
2 coats = Sometimes necessary
Total: enter area

Wood type and application method can vary coverage.

  • Concentrated dissolvable cleaning capsules for exterior decking and timber
  • Pack contains two sachets making 5L to treat up to 24m²
  • Kills and removes moss, mould and algae
  • Opens up pores of the wood for better penetration and adhesion of oils and stains
  • Convenient pack size for easy storage - No large tin or container
Brand Ronseal
No. of coats 1-2
Coverage Up to 4 per litre
Drying time hrs
MPN 36438
GTIN 5010214864386

To prepare decking or other garden wood for cleaning with Ronseal Decking Cleaner, first remove any debris including leaves, twigs, soil, weeds and large amounts of moss and mould using a stiff brush. Do not wet decking.

Always do a small test area before starting any project and follow the manufacturer's instructions on the packet at all times.

How To Clean Decking

  1. Remove the cleaning capsules from the outer packaging
  2. Cut the inner case to remove the capsules - be careful not to pierce them if you use scissors
  3. Place one capsule of deck cleaning solution into 2.5 litres of warm water or two capsules into 5 litres of warm water (Warm water will allow the decking cleaning capsules to dissolve more quickly)
  4. Stir and leave the capsules to dissolve for 90 seconds (3 minutes in cold water)

How To Clean Algae From Decking

  1. Once diluted, apply to areas needing treatment using a watering can, Ronseal Sprayer or a brush
  2. Allow to dry fully
  3. After 2-3 days any green appearance will have disappeared
  4. Clean the wood after application by using a brush to clear away any remaining dusty deposits

How To Clean Moss and Mould From Decking

  1. Apply the cleaner with a watering can, Ronseal Sprayer or a brush
  2. Scrub the deck well with a stiff bristle brush and leave for 10-15 minutes
  3. Wash off with a brush and water or hose down ensuring all residues are washed away

Please note: When using this product, take care to protect plants, fish ponds, rivers and drains from contamination. This product may remove partially deteriorated or flaking coatings when applied to clean decking.

Q. Can I use Ronseal Decking Cleaner to remove the old decking stain or decking oil from my deck?

A. Unfortunately not. This product has been designed to clean and remove mould, algae and fungi. If you want to remove an existing decking stain or decking oil, you will need to jet wash the decking or use a decking stripper / remover.

Q. Is it safe for my plants?

A.This product is hazardous to plants when wet but safe when fully dried.

55 customer reviews
Never brought this product before but was told its good , it's absolutely amazing by Annmarie Harcup
Reviewed on: 18/04/17
Super easy to use by Danielle
Reviewed on: 14/04/17
Efficent decking cleaner prior to applying the decking oil by Charles Ross
Reviewed on: 12/04/17
Very good by Anthony Mcgrath

Cleans the decking very well.

Reviewed on: 06/04/17
Good by Mr James Casswell

good product price and delivery what more do i want

Reviewed on: 05/04/17
Always use it by Stefano Bruno
Reviewed on: 30/03/17
Does the job by David Munro

this contains phase-transfer surfactants, and is very useful in situations where acid-based algicides might cause corrosion on adjacent surfaces

Reviewed on: 26/03/17
Have used for several years prior to using oil for decking, very good results by Sue.Caldwell Shot

Have used for several years prior to using decking oil and very pleased with results.

Reviewed on: 07/03/17
Easy to use by Mr Dennis Freeman

Excellent product

Reviewed on: 03/11/16
A nice finish after a good scrub by hand for grubby decking by Adrian Ling

A nice finish after a good scrub by hand for grubby decking

Reviewed on: 24/09/16
Easy to use Certainly shifted the dirt and algae by Mrs Morag Skene

Worked very well. After using, decking was completely free from dirt and algae, ready to be oiled.

Reviewed on: 18/09/16
Good by Chris Moore

Cleaned the tired old wood nicely ready for oiling.

Reviewed on: 09/09/16
Again very easy to use by Mr R Huckfield

Cleaned NEW decking I thought was clean already?

Reviewed on: 20/08/16
Good by Barry Ward

Easy to use

Reviewed on: 12/08/16
Excellent product which cleans weathered and greyed wood especially areas which have been prematurely exposed due to wear especially on horizontal areas of decking by Mr E Goble

Easy to use and thoroughly recommended for use prior to Ronseal decking oil especially on weathered timber.

Reviewed on: 27/07/16
Better than buying the tins by Philip Asselin

Cheaper than the 5L containers and was very easy to use. Definitely worth cleaning the decking with this first as a lot of grunge came up.

Reviewed on: 23/07/16
Nice item by Kuljit Jaye

Cleans well. Read the instructions carefully. Works best if you leave the cleaner for a couple of days for it to work in to the molded area.

Reviewed on: 09/07/16
Brilliant easy clean by Ged Cook

First time I've ever used this product very easy to use and comes up really clean

Reviewed on: 04/07/16
Okay but not great by Richard Bowen

Did not remove the more established algae

Reviewed on: 15/06/16
Only partially successful by Walter Simms

A finer spray application may have been better or a second coat but I did not have time to reorder

Reviewed on: 10/06/16