Saturate the wall surface before you apply any cleaning solution. A dry wall will absorb cleaning solution and you may get mortar smear, white scum, efflorescence or green stain
Mix chemical solution carefully. Overly concentrated acid solutions can etch the mortar joints, or even exposing the sand in the mortar. It can discolour the brick particularly lighter shades. This is called acid burn. Use only approved chemicals that are specifically designed for the cleaning of Clay face bricks. Always test the product on the same bricks that you will be using before you start the project and check that it does not cause any discolouration.
Protect windows door and trim when cleaning bricks. Many cleaning agents, particularly acid solutions, have a corrosive effect on metal. They may also pit and stain masonry surfaces and trim materials such as limestone and cast stone.
Alkali sulphates (Efflorescence) appear because they exist somewhere within the masonry wall, either in the brick, the mortar, or the grout, or possibly a combination of these three. Tests performed by BOBS reveal that there is no efflorescence present in Makoro Bricks. It is however important to know how to deal with it should it appear on the walls. When efflorescence is light, you can remove it with water and a brush. In more severe cases, wet down the wall and scrub it with Masonry Cleaner, or white vinegar. Flush the area several times with water when finished.