Hey Jerry, sounds good to me. I don't know what kind of mining you're into, but most of my family are coalminers in West Virginia, Kentucky, and Virginia. One of my cousins is a mining engineer in Pennsylvania. So, yeah, I'll be your apprentis.
I haven't been cleaning many coins lately, but I think using the Gringott's powders is about the fastest way that I know how to do it without brutalizing the coins. Using whichever one is most appropriate for the type of encrustation, along with some gentle scrubbing, might remove enough dirt to satisfy them without ripping off the patina. Maybe someone knows a better way, but that is the best I can think of since I am guessing they don't want to mess around with soaking them for months.
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