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Avoid aluminum alloys when working with vinegar solutions! With time, the pH effect of acetic acid can penetrate the protective oxide coating. The exposed Al will even react with water: 2 Al (s) + 6 H2O (l) --> 2 Al(OH)3 + 3 H2 (g) and with the presence of alloy metals, galvanic corrosion (especially if the 'dirt' is rich in salts that can serve as a good ...

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