WOAH, muriatic acid. I have a 4oz left in a 128oz container. Always afraid to use it, but never thought of using it for this purpose. I need to educate myself on the proper use of this stuff so I don't end up on the news.
Good to know it's only $9/gallon. I need more to clean the brick wall once spring arrives.
You're going to hear all kinds of "YOU CRAY YO" baloney about using it. A modicum of common sense (don't sniff it - don't get it in your eyes - if you spill it wipe it up etc) you'll be fine. The stuff is used to lower the pH in swimming pools and "pH Down" aquarium treatments it's so "deadly".... I don't bother using gloves. If you have sensitive skin then do so. Otherwise use at your discretion.