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

Question

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?

Leo · Accepted Answer

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

Drew · Answer

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.

Joe · Answer

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

Scott · Answer

Efflorescence. Basically salt that is in mortar and masonry

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

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