ChimneyRx® Safer Brick & Masonry Cleaner is a safety breakthrough in acid cleaning for commercial and home use. Use for any tough acid cleaning or etching job, where you would normally use Muriatic Acid. The chemical composition of Safer Masonry Cleaner is the same as Muriatic Acid with proprietary additives. The patented chemistry virtually eliminates the dangerous, toxic fumes and potential acid burns normally associated with Muriatic Acid. Remember, shipping is FREE (contiguous US only).