This may be a bit late, but....use Hoppe's No. 9, bronze wool and brass brushes/scrapers. You will not cause any harm to the metal or any remaining original finish/patina. My budget usually does not allow the purchase of top-end firearms, so I have 30+ years of experience cleaning well used antiques! It is truly amazing what you may find under a thick layer of 'patina' (a much abused term in the gun trade). Good Luck!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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