What about other acids, ie Muratic?

I saw it at Lowe's a few weeks back. I think it was 20% acidity.

a word of caution if using muriatic acid (hydrochloric acid) - the
description as labled probably is 20 baume (specific gravity) 20% acid
by weight...use caution when using it as it will burn your skin and
don't breathe in the vapors or any vapors that are emitted when or if
it comes into contact with anything. very nasty stuff - it even eats
up steel!!!