Citric acid solution cleans stubborn dirt preferably in hot water mix but a creme of tartar solution next will add shine. Get a bucket fill it with hot water about 2 litres and add about a teaspoon of citric acid powder.Add brass with primer out. Keep swirling around from time to time. You will see it doing the bizo. Then dump . Rinse with bicarbonate soda. Then do a c of t solution. Rinse and dry.
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