It won't hurt the value if you CLEAN them. Heavy crud can be carefully scraped off. A brass bristled 'tooth brush', from your local hardware emporium, can be used vigourously to remove various forms of verdigris. Quite often the brass will remain stained, which is understandable. Good Luck!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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