Muriatic Acid/Hydrochloric Acid (32oz, 35%)

Be careful opening the package; mine had liquid sloshing around in the protective wrapper.

After watching a 'how to' video on the proper use of muriatic acid, I am here to say, this stuff is great. My son made me a step from my sidewalk to the carport, using old reclaimed bricks, which had a lot of old mortar on them. Once the step dried completely, I used this muriatic acid, and the results were beyond my expectation. The bricks cleaned up beautifully, and the step looks marvelous.