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I believe muriatic acid is a weaker form of hydrochloric acid. Muriatic acid can probably be picked up at your local hardware store. It is commonly used to prepare concrete for painting or can be used to speed up the patina that copper takes on with age. As a lifeguard, many years ago, we used it to eat the concrete away from the agregate to make the pool deck less slick.
HTH,
Harold
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