What is the recommended cleaning approach for new masonry to avoid damage to mortar and units?

• A. Use high-pressure washing with detergents.
• B. Use mild cleaners, avoid high-pressure washing, and rinse thoroughly after cleaning with appropriate methods.
• C. Do not clean masonry until years after installation.
• D. Use bleach and strong acids to sanitize surfaces.

Answer: (B)

New masonry is still curing, so cleaning must be gentle to protect both the mortar and the units. Aggressive methods like high‑pressure washing can erode soft, setting mortar and even loosen bricks or blocks, pushing water into joints and causing damage such as cracking or later efflorescence. The best approach is to use mild cleaners suitable for masonry, work with a soft brush or other low‑pressure methods, and rinse thoroughly with clean water using methods appropriate for masonry surfaces. This minimizes the risk of damage while effectively removing dirt and residues. Waiting years to clean isn’t necessary, and using bleach or strong acids can attack the mortar and damage the face of the masonry, so those are not appropriate for new work.