Tried the wax scrub... nice.

Worked during college in a musical instrument repair shop, mostly brass and silver fabrication, shaping, buffing and finishing. Some brasses work harden quickly from contact with mandrel or hammer or manipulation or buffing. Have seen some high end instruments quickly fissure crack.

After trying the polish and corncob, may try some shaved Tripoli buffing compound into the cob mixture. Rouge is a great finish compound but requires degreasing.