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My technique varies from tossing the whole works onto a ziplock and soak it full submerged to slithering it on with a q-tip. In any event I let it soak in for 24 hours, then wipe it down and asses...

It looks like you should be able to get this little beauty cleaned up and ready for another 150 years of work without too much elbow grease. A prime candidate for a patina treatment once you have it...