CAUTION!!!!!! Those that are corroded MUST NOT be fired whether or not you remove the patina. The corrosion GREATLY weakens the brass case and to fire them is inviting a VERY EXCITING EVENT! (This is the voice of experience here!) High pressure gasses can (will!) burn through dumping high pressure gas into the rifle action and out every vent, crevice, cranny and hole in it.
To clean for display, you might try very fine steel wool.
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