The answer:
The traditional lime remover for masonry is hydrochloric (muriatic) acid. It is readily available at builder’s supply houses and dilution instructions are on the container. Be sure to utilized proper safety equipment (PPE) and it would be a good idea to test the product and process in a small area (3 to 4 inches) to see that you are getting the desired results before widespread use. Follow the directions on the container closely to avoid ... — Lynn E. Krafft, ICAN/ATEX editor
