It depends on the coin. In this case, the verdigris was completely removed in about 10 seconds with just a soak like you see in the picture (a few drops on the surface). However, I treated both sides since I'm submitting to PCGS. I allowed the the coin to fully dry for 24 hours (both sides), put it in a plastic flip and gave it to my dealer. Now I have to probably wait 3-4 months to get it back.
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