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Vintage AKG 414's - cleaning questions

Hey guys...
As some of you know, I have 2 Vintage AKG C-414's with the original Telefunken CK12 Brass Capsules.
These were the capsules that were used in the Telefunken ELAM and the AKG C12 mics. The C-414's also used this capsule until around 1980 or so, at which point they changed to a mylar diaphragm.

audio restoration help cleaning the file of noise

Hey guys,

I've got a request, but I'm not sure if these are the right forums to come asking. If they aren't, please point me in the right direction, because Google did not.

There is a particular audio file I have of an old song that has some damage. It's mainly that annoying crisping sound throughout the song, but it really bothers me because it's such a beautiful song.

Cleaning Cymbals?

Hey, I've got a bunch of really narly looking cymbals. Some of them are nice ones most are not though. I have tried to clean them with brasso with no success. Is there a way to polish them back to new sheen or is it not possible? Does cleaning them help the sound a great deal? I'm not exactly a "drummer" but I like to play and record them.