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Cleaning brass with a mixture of salt and vinegar works due to the chemical reactions that take place between the brass and the acidic solution.  Brass is an alloy of copper and zinc, and over time, it can develop tarnish and corrosion, which are typically a combination of copper oxide and other compounds.  The salt and vinegar solution works in the following way:  Acidic Action: Vinegar is a mild acid, primarily acetic acid. When it comes into contact with the brass, it …