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					Originally Posted by Battara  GP brings out some good points.  
 I use Johnson's Baby oil for my ivory pieces since it is less acidic.
 
 As for the metals, it would be a good idea to carefully clean off the dirt on them or else they will not just oxidate but corrode the underlying copper structure.
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much obliged, I  an only fullhearted support this. Found some pics of mine 3/4 cleaned in the way Jose described . 
FYI: mine were in exact the same condition as the above uncleaned one ( both bone handle as metal part).
You can compare the above uncleaned one ( first pic below) with my 3/4 cleanded ones and see for yourself...both bone as metal looks better