So I'm getting into antique porcelain shaving jars. They're virtually sold out from most websites I come across but they look incredible and found a few that are just lids (they're called pot lids).

The lids are significantly cheaper than finding the complete jar, and I can spend some time hunting for a matching bottom, however the few lids I have found are horribly stained. Does anyone know how to remove the stains from these without removing the artwork?

***The cracking in the porcelain is called crazing and the staining occurs when dirt, oil, bacteria, etc. settle into the cracks. I've found a few ways to cleaning them (hydrogen peroxide, bleach, etc.) but I don't know if using those would smear off the artwork on the lids.

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