@dogmatix I have also gone the citric acid route with the dishwash liquid added into it with hot water first time with that brew I left the ultrasonic cleaner going for 24 minutes but came out with a small amount of pink residue on the headstamping but came off when wiping them over after drying in hot water cupboard they came out nice and clean though. Another thing I was reading was to soak the brass in meths after ultrasonic cleaning to help disperse the water after rinsing.
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