Brick and Mortar Cleaner is a breakthrough in cleaning masonry! It has the cleaning power of Muriatic (hydrochloric) acid yet, when used as directed, it won’t produce toxic fumes or cause burns. Now you can have the cleaning performance of a powerful acid cleaner with an unprecedented level of safety to users and surrounding surfaces. Brick and Mortar Cleaner safely removes most stains from masonry, including rust, efflorescence, and mortar splatter. It won’t blacken, streak or damage metals such as aluminum used in chimney flashings. Brick & Mortar Cleaner can be used full strength for tough jobs or diluted for lighter cleaning. Coverage is 50-150 sq. ft. per gallon depending on the porosity of the surface.