Lots of discussion about this. If it is near mint, I would be tempted to leave it alone. If not, then there is an excellent article under General Information on your left that explains how to do this.
No matter what, a gentle cleaning shouldn't harm them at all.
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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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