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Product Details

Hydrochloric acid-based cleaner for trade use only. Removes heavy cement and mortar stains from brick, concrete, paving, scaffolding and tools. For exterior use.

Hydrochloric acid based cleaner for exterior use. Removes stubborn stains, limescale, ingrained dirt, heavy cement and mortar stains from brick, concrete, paving and patios, scaffolding and tools.
Apply by brush. Use protective goggles, gloves and clothing to cover face, eyes and skin. For exterior use only.
Dilute as stated and test on a small concealed area before proceeding to clean the whole area.

Technical Specification
Brand Bostik
Unavailable offshore
Age restricted (18)
Manufacture ID 30812503
Safety Data Sheet click here
Volume (L) 5
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 8pm Mon-Sat (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Bostik Concentrated Mortar & Brick Cleaner 5L is rated 4.5 out of 5 by 31.
Rated 5 out of 5 by from Works well Really impressed worked really well cleaned mortar off brickwork as required
Date published: 2019-09-16
Rated 5 out of 5 by from Excellent effective product I have bought this in desperation - after 2 months of nearly constant raining even strawberries parsley and pansies started growing between and on top our block pavement, not mention moss, algae, lichen, grass and other common weeds, many of them knee high. I thought that I can stand a chance with powerful wild Scottish Nature only with the concentrated Hydrochloric Acid. We have used previously a good few pavement cleaners but they seemed to add nutrients to the weeds, making them no harm, but rather increasing their growth. This stuff is different – it’s really powerful, after only 1st spraying application, within a few hours the moss changed color and within a 2-3 days weeds and all plants dried and died. The Cemetone seems to work not only on overground parts, but as well underground, making roots to dry and shrink, so they are very easy to remove from the pavement with the hoe. It would be much quicker to jet wash, but we did not want to add water, as this would encourage weed growth after a few months (previous experience). After scrubbing the pavement 2nd spraying application to keep the pavement clean from weeds for longer. Side effect is that pavement is slightly cleaner even without pressure washer. We have used very concentrated solution - 2 parts of water and 1 part of acid, remembering to add acid to water. This solution did not dissolve/effervesce brick block pavement. Great product, easy to use and did perfect job getting rid of all the various plants from the pavement.
Date published: 2019-09-10
Rated 5 out of 5 by from Excellent effective product but needs care. This is concentrated Hydrochloric acid, so dilution required for most scenarios. Mix Acid product to Water, not water to acid, and extreme care. safety glasses, gloves. No fumes from 5L bottle, but this HCL/Alcohols is odourless, so well ventilated required if diluting indoors. Undiluted this product will immediately start to dissolve/effervesce chalk, calcite deposits, concrete, efflorescence, calcium carbonate and requires dilution. On bricks wet surfaces firsts to stop absorbtion. Do not allow cleaning process to dry as even harder deposits can occur. Even at very dilute 30 parts water to :1 dilution as still effective however hours required. Manufacturer's Label dilution of 4:1 advised on label but 10:1 to 15;1 as even safer and still effective.
Date published: 2019-08-13
Rated 1 out of 5 by from No good I bought 10Lt to remove some paint from brick wall,I think my containers have been filled with water
Date published: 2019-07-19
Rated 4 out of 5 by from Good farts from the lizard company Its cleaned up the bricks really nicely. It lost a star because it smelt of farts.
Date published: 2019-07-10
Rated 5 out of 5 by from Great cleaner I bought this because some idiot decided to paint Graffiti on my Brick Wall. Cleaned most of it off and cleaned the Brick at the same time.. Brilliant..
Date published: 2019-07-07
Rated 5 out of 5 by from Brilliant for heavily soiled block paving I wanted something to clean red brick block paving which was covered in years of grime, algae and lichen. I was apprehensive about using such strong acid as this product, but the recommended dilution strength really softened the grime layer so that a rotary brush pressure washer had a much easier job removing it. I still needed a wire brush on some persistent lichen and black spot mould spots but overall I was very pleased. I reckon I could have used a slightly stronger solution for the more heavily soiled areas, but be aware that when the solution comes into contact with cleaner bricks, it really effervesces and dissolves the top layer. It gives of a very acerbic odour, so wear a good face mask and glasses.
Date published: 2019-07-05
Rated 5 out of 5 by from Powerful This is concentrated stuff, NOT ready for usr. It is extremely strong. If you have had no success with othet products, try this!
Date published: 2019-06-27
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