Soften the crud, with the solvent of your choice, and use bronze wool and brass toothbrushes to remove the deposits. The brass and bronze will not harm any remnants of bluing or natural aged patina. The brass brushes are easily found in your local hardware emporium in the plumbing/soldering aisles. Good luck!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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