I don't know if this will work or not, but would ultrasonic help? There are ultrasonic cleaners for jewelry. Use that with dry cleaning solution? I know ultrasonic cleaners are promoted as being able to remove tarnish.
And of course it's best to just leave it, but this may be one solution.
John
QUOTE(Bluehawk @ Feb 24 2009, 07:54 AM)

Thing is, it is practically impossible to remove all the tarnish on bullion, by any known means - especially without staining the surrounding textile material.
So, if you do surface clean (and, by the way, good toothpaste IS a wonderfully gentle abrasive) then the bullion is likely to end up looking like it has had its surface cleaned - there will still be tarnished areas where you could not reach... probably.
Or, the bullion will look like it was made "yesterday" - and that ain't possible if its McCoy.
I'd leave it be.