Sulfuric acid
A long wiki link on the subject can
be found at: http://en.wikipedia.org/wiki/Sulfuric_acid
I myself use it (very carefully) for
lead-acid batteries, and even to "boil out" old hair clogs in a half
century old bathroom shower drain. Of course, I have to think about the
downstream effects, also.
If it gets on your skin, or you
breathe the vapors, it will do you harm.
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