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Citric acid powder is mixed 2 teaspoons to a quart of almost boiling water. High concentrations are not needed. Citric acid is the active ingredient in home-made brass cleaners that use lemon juice.
The advantage of citric acid is that it will not penetrate or damage the brass like ammonia-based brass cleaners will. it works very fast in less than a minute. Citric acid passivates the brass, which means that after washing in the hot solution, the brass is actually made more corrosion-resistant.
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