Moe145, allow me to "qualify", my statement: This only applies to FE,
IHC, wheats, and CanadianCENTS. I do not even attempt other metal aoolys, pure, or otherwise. I don't collect them to that extent.
So, in answer to your questions, yes it does work, and I'm happy with it. The coins do not come out "bright, shing clean! They still will have a bit of the crud in the very small places, that are too inaccessable to reach with a thiorn, so it stays. I remove as muct as possible, very gently, so as not to scratch, or otherwise damage the patina of the coin. This will usually allow me to determine if there are any RPD', MPD, etc, andat the same time leave the coin "untouched", as far as cleaning goes. I have tried the methods of many different members of the various forums, on common , everyday wheats, and had different degrees of success, and failures. No matter which method you try, USE COINS THAT ARE ONLY WORTH FACE VALUE! That way you still have that value, when you "recycle" them, after making your test. I do not "do" any other coins, so I can't give you any of my results. FYI, I have seen coins that still have the crud in place, and the coins are worth four figures! When in doubt, send your coin to an expert, and get his opinion, as to what you have, and then you won't have to wonder. good luck with your "washing, and or cleaning"!
Dick