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Frequently Asked Questions
Question

A mason I know uses muriatic acid to clean brick. When I tried to tell him it was a bad idea, he responded by showing me several websites and magazine articles that recommend muriatic acid! Where does the idea that muriatic acid cleans brick and block come from? Is there anything to it?


Answer

Use of muriatic acid as a masonry cleaner predates World War II. Then it was the only product available. Since then, developments in the kilning process of clay products, plus changes in types and number of additives in brick and concrete made muriatic acid obsolete and even harmful for masonry cleaning. Relatively recent advances in the overall construction industry such as colored mortars, aluminum windows and stainless steel trim have made muriatic acid even more undesirable for cleaning masonry. Don't use it.
 
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