What is the white substance on bricks and how do I remove it?

Is it mould?? I’ve got white patches along the wall outside my house, it’s the side that never sees sunlight so I think it could be mould or something. How can I solve the problem?

Asked by Jenny on 11th Apr 2020
Expert Trade Answers
"Hi Jenny,
The white stains is called "LEACHING" which is a salt deposit.
Often contain excessive moisture which evaporates and transfers salt deposits, which can remain on the bricks work if not treated.
5 steps solutions are:-
1. Scrub the powdery stains (white stuff on bricks) off the bricks surface with a dry stiff bristle cleaning brush.
2. Dampen cleaning water. Do not soak the sponge, wipe the slightly moist sponge over the bricks to remove loosened efflorescence dust that the brush missed.
3. Fill a regular spray bottle with distilled vinegar. Disperse the vinegar generously onto the bricks. Let the efflorescence absorb the vinegar for about five - ten minutes.
4. Scrub the remaining efflorescence thoroughly off the surface of the bricks with the brush.
5. Moisten the cleaning sponge in fresh water as previously done, remember, do not soak the sponge.
Wipe the barely moist sponge over the bricks to rinse away the vinegar.
6. Finally, let the bricks surface air dry.

Thanks a lot"
Answered on 11th Apr 2020 - Member since Jan 2020 - report
"Hi, Its likely salt effloresents coming out the brickwork. This is very common. You need to use a strong hydraulic acid to remove it. This is something we can help with and it's not expensive should you get stuck."
Answered on 11th Apr 2020 - Member since Feb 2020 - report
"Hi, it’s Alkaline from the Cement used in your Brick Joints.
Brick Acid is usually best bought at any DIY Store. Directions are printed on the Canister or container.
Best wishes Joe"
Answered on 11th Apr 2020 - Member since Feb 2019 - report
"Efflorescence. Basically salt that is in mortar and masonry"
Answered on 2nd Jun 2020 - Member since May 2020 - report
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