How do I remove white desposits from my brickwall (efflorescence)?
Efflorescence is caused by water entering the wall and dissolving salt that could be present in the mortar or in the bricks or in both into a solution which is brought to the surface. The water evaporates leaving these white deposits on the surface of the wall. Dry brushing is the first method of removing efflorescence. If this is not effective, water washing with or without pressure can be used. If this is not effective chemical cleaning is the last alternative. Chemical cleaning involves acid treatment to dissolve the white deposits. Acid treatments can often cause etching of the masonry especially concrete masonry. Thus fading, streaking and changing colour of the wall may result if chemical cleaning is not carried out correctly and by experienced operator. After cleaning if efflorescence reappears, the source of water pentration of the wall must be investigate and addressed before any recleaning.
