how to remove alkaline battery residue
Acids are what's used to etch porcelain bathtubs for "refinishing"
with epoxy paints. Even leaving chlorine bleach solution puddled
on the tub surface will etch it -- I found that out the hard way.
Which acid or acids? Decades before I saw "Breaking Bad", I knew that
hydrofluoric acid attacked glass and porcelain. But hydrochloric?
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