For Pros and DIYers, Klean-Strip is the leading brand of solvents, thinners, removers, and cleaners that are dependable for reliable results. Klean-Strip Muriatic Acid can be used to etch concrete, brighten concrete and masonry, or remove excess mortar from bricks. 90% lower fumes than standard Muriatic Acid. Read entire label prior to use or storage. Keep out of reach of children.