Barrettine Mould and Mildew Cleaner 4L

  4.7/5.0   41 reviews
You'll need enter area above for 1 coat (Usually sufficient)
You'll need enter area above for 2 coats (Sometimes necessary)

Wood type and application can vary coverage

  • An effective multicide, fungicidal wash for the control of mould, algae and fungi
  • For use on most surfaces including timber, concrete, brick, plaster, stone and tiles
  • Perfect for interior and exterior use
  • Ready-to-use from the container
  • Contains biocide for the control of organic growths
  • Low odour
Brand Barrettine
No. of coats 1-2
Coverage Up to 10 per litre
Drying time 24 hrs
Size 4L
GTIN 5015861000859

Barrettine Mould & Mildew Remover is perfect for use as a pre-treatment for wood that has developed mould, algae or fungi, prior to the application of a wood oil or other wood finish. Also contains cleaning ingredients to remove light surface dirt from plastic, wood and other substrates but does not contain bleach.

Looking to clean your driveway, decking and patio areas? Barrettine Driveway, Decking and Patio Cleaner is perfect for the job.

Learn more about how to keep your decking looking fantastic on our blog.

Why not take a look at the second blog post in our series of three about wooden decking maintenance, preparation and preservation?

Before applying Barrettine Mould and Mildew Cleaner, remove as much surface dirt, debris and organic growth as possible with a scraper, stiff brush or broom.

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

For maximum biological effectiveness it is recommended that Barrettine Mould & Mildew Cleaner is applied to dry surfaces.

This product can be applied by brush, roller or re-used kitchen spray bottle at a rate of 5 to 10 meters square per litre, depending on how porous the surface to be treated is.

Only use Barrettine Mould and Mildew Cleaner when the surface and ambient air temperature is above 5℃.

  1. Apply by brush, roller or spray
  2. Scrub the treated areas and leave to dry for 20 minutes
  3. When dry, rinse off all substance
  4. Repeat if necessary (2nd application not normally required)
  5. The wood is now ready for finishing

To maximise biocidal effect, follow same instructions as above, however leave for 24 hours to dry before washing off.

Once the wood has been treated and cleaned with Barrettine Mould and Mildew Cleaner it is ready to be treated with a wood preserver to protect against future infestations and finished with an appropriate wood oil, paint or stain.

41 customer reviews
If you follow the instructions you won't go wrong by Mrs S Cohen

Our oak porch was covered in black mildew spores which was really spoiling the original look. This cleaner along with a wire brush and wire wool made light work of revealing the beautiful oak underneath. Very pleased.

Reviewed 4L on: 03/10/17
Product received as ordered, on time and well packaged by Bryan Sanderson

The mould killer worked better than anticipated.

Reviewed 4L on: 11/09/17
Did the job by P J King

Needed to clear green growth on pergola prior to retreating. Scraped surface down with steel wool, applied cleaner, left it for day, the dead material turned white but it didn't bother me because I followed up with dark stained treatment. ps I spilled a bit on some moss below and it turned that white too so take care to protect your plants.

Reviewed 4L on: 07/06/17
Easy to apply and cleans up well by J Kane

Used this to clean up my garden sleepers before staining them. It worked a treat. Easy to apply and would recommend it to anyone. Not much more to say. I will say that the wood-finishes team were a great help, had great prices and fast delivery.

Reviewed 4L on: 22/04/17
My old garden chairs were quite dirty and it needed 2 attempts to clean them up by Mr C Kewish

Did the job, but didnt get the deep ingrained white fungus marks off

Reviewed 4L on: 12/04/17
Bravo completely! by Blair Templeton

Fantastic product producing a clean surface to treat!

Reviewed 4L on: 23/03/17
Cleaned up very mouldy decking by Mihai Cucos

Needed to clean some very dirty decking - it was absolutely caked in thick black mould and hadn't been touched for about 10 years. Used the more concentrated dose of the product and left it on for about 20 hours. Bit of elbow grease and water and the decking is good as new. Can't ask for more really.

Reviewed 4L on: 14/03/17
Easy to use by Tim Ellis

This product worked really well. I was using it on an old railway sleeper that has been left outside for 100 odd years. It cleaned it up really well after two applications

Reviewed 4L on: 05/11/16
Very useful product by Andrew Bedford

Very straight forward to use with clear instructions - helped clean shed prior to applying a preserving product. Delivered extremely promptly.

Reviewed 4L on: 16/10/16
Has done the job by G Warren

Easy & quick to apply. Has done the job I required. Good advice from wood-finishes direct

Reviewed 4L on: 09/10/16
Thin consistency but did the job by John Roberts

Difficult to apply without splashing it but it did seem to be absorbed by the wood - time will tell how effective it is as a preservative

Reviewed 4L on: 09/09/16
Good Quality Cleaner but can't shift old Mould by Osman Saeed

Good quality cleaner that has managed to clear a fair mount of build up but can't shift old mould.

Reviewed 4L on: 07/09/16
Easy to apply and clean's timber well by Praill

Used on Siberian larch to remove site dirt and surface mould. Cleaned majority of timber apart from well impregnated sap stain.

Reviewed 4L on: 30/08/16
Did the job, perfectly! by Matthew Lewis

Applied this product to a fence using a car wheel brush, left it for an hour, rinsed down with water....job done. All green traces gone. Would use again.

Reviewed 4L on: 12/07/16
Easily applied by Nigel Double

This was used to make sure of no mould or mildew. I used the bit remaining on some green growth on a fence and it did the trick.

Reviewed 4L on: 25/05/16
Excellent algae removal by L Brown

Upon WFD's recommendation I used this product to deep clean my 15 year old decking which I normally power-wash annually. However the power washing wasn't actually stopping the build up of algae which is so so slippery when wet. I applied according to the instructions using a Manns Decking Applicator (a sponge on a broomstick), left for 24 hours, then wetted and scrubbed by hand. I would not describe this as a simple, quick fix. It took hours of hard labour to scrub into the grain of the wood to dislodge the grime and algae, but the produce really did lift the muck out. You need to keep it wet, and keep wetting it for best results. I then used it on my wooden garden furniture - again a labour of love, but it does seem to lift ingrained green muck and leaves the wood looking fresh and clean.

Reviewed 4L on: 16/05/16
This seems to work well when used on a fence that was going green by Euan Lockie

Splash it on and it seems to kill of the growth. Time will tell if it lasts, but I am also putting on the preventative coats as well.

Reviewed 4L on: 21/04/16
Easy to use does what it says by Gerald Murphy

good on pressurised wood but not on plywood

Reviewed 4L on: 28/01/16
Easy to use by Christopher Stables

this product does kill mildew as described however it does leave the dead mildew residue. The bleach based type of killer does completly remove all traces

Reviewed 4L on: 27/12/15
A note from us...

Hello Christopher,

The Cleaner does do a great job of killing off the Mould and Mildew, but does require some scrubbing with an appropriate brush to remove and clean the surface.

To prevent the Mould coming back we would recommend a good quality Preservative. Please let me know if you need any help with which products to choose.

Kind regards Sam.



Reviewed 4L on: 23/09/15