I would not be surprised to see the bluing blemished from the foam and chemical reactions.
As said above, most oils would dissolve it, acetone would work best, then after cleaning it, use gun oil.
Clean well, but don't overdo it, less is better in this kind of 'cleaning'.
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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