North Carolina Building Contractor License Practice Exam

What should not be used for cleaning masonry unless otherwise acceptable?

1. Soft brushes

2. Potable water

3. Acid or caustic solutions

4. Natural cleaning agents

The correct answer is: Acid or caustic solutions

The use of acid or caustic solutions for cleaning masonry should typically be avoided unless there is specific guidance or acceptance for their use. This is because these types of cleaning agents can be overly harsh and potentially damage the masonry surface. Acid solutions can react with the lime in masonry materials, causing deterioration, discoloration, or even structural issues over time. Using caustic solutions can also lead to similar detrimental effects. In contrast, soft brushes, potable water, and natural cleaning agents are generally considered safe and effective for masonry cleaning. Soft brushes help to remove dirt and debris without scratching or damaging the surfaces, while potable water is safe to use and helps to rinse away impurities without any adverse effects. Natural cleaning agents are usually milder and less likely to cause harm, making them more suitable for maintaining the integrity and appearance of masonry structures. Therefore, it's important to prioritize safer cleaning methods to protect the material.