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Message:: [QUOTE="GDJMSP, post: 2480949, member: 112"]Think about what it is that you are trying to do. You're trying to remove a build up of a combination of plain ordinary dirt, body and finger oils, and corrosion caused by simple exposure to the air - all that have accumulated over a period of years or even decades. And accumulated in tight, protected spaces, and become hard, compacted, and resistant to any type of removal. And you're trying to do it on copper coins, coins that are the most susceptible to undesirable color changes. My point is this - at best it is very difficult to do. And at the same time it is very easy to ruin the coin with your efforts. And while acetone and xylene work well on soaking into and removing some things, they often don't work well on other things. On some things, a long soak in ordinary distilled water works best. And that's why that is what you should always start with. In the end, you might, or might not have limited success. But limited success is about the best you can hope for. And once achieved you should let it go at that.[/QUOTE]