"Fish Head" wrote in message
...
If you have any stainless steel ball bearings or a length of stainless
steel chain, you can drop these into the keg and agitate the keg.

That's too much work! Just use a strong solution of sodium carbonate
(washing soda) in hot water to dissolve the tartrates and loosen any other
crud in the keg. Rinse with copious amounts of cold water and drain the keg
upside-down.

Tom S