[oldeguy]

If your going to use Muriatic Acid, especially in a spray bottle, wear a vapour mask, like the type to use when you are spray painting. This acid will hurt, and burn like ^%^@#$$^* if your not careful. When you spray this stuff, no matter how careful you are, you'll be breathing in some of it. We use this stuff to clean the ceramic and grout on pool floors, anywhere where there are ceramics. This stuff can kill, if your not careful.