"Muriatic acid can be bought at most pool supply stores"
I did not know that, good to know, I have a concrete patio that needs cleaning
"Battery acid (Sulfuric acid) is sold at most auto part stores"
I know the stuff (used to be a mechanic as well) and don't like it. Seen what it can do to a car and have gotten it on me as well.
I completely agree with your set of guidelines.