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[–] o0shad0o 0 points 1 point (+1|-0) ago 

Don't the valves unscrew? You should be able to replace the gasketing in them.

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[–] 9037987? [S] ago 

Actually, the valves chafing beautifully, I'm wanting to remove the tarnish.

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[–] o0shad0o ago 

A little google-fu says that instruments like yours are typically varnished, which means you'd want to remove the tarnish and then re-varnish, which might be a bit much for you to do yourself. I'd have to opine you find a place to take or send it.