Corroded 43 Mauser Brass

If it's just a light coating, either a bit of time in your tumbler or 0000 steel wool. A .45 calibre wire cleaning brush will do the inside. Heavy corrosion likely means the brass is toast.
 
Try soaking them in vinegar diluted 50/50 with water for five minutes, then clean up with steel wool soaked in same. Repeat as necessary, then rinse thoroughly in clean water.
 
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