With Alcohol, Remove ALL the Oil! Soak it for a few minute, agitate a few times.
My self, I would try this method.
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http://www.youtube.com/watch?v=vGCx9HZwYBo#noexternalembed
Prior to that, I would follow this procedure.
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http://www.corrosionist.com/cleaning_copper_pennies.htm
Here is some good info.
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http://gometaldetecting.com/cleaning-finds.html
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http://www.thunting.com/smf/index.php/topic,25396.msg176706.html#msg176706
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