That was the figure they gave back when the program was still active, now that it is currently shut down they no longer have a link to the information. There is a article online from another site from about a year and a half to two years ago that does mention the $20 figure as well. It was originally posted before the program suspension.
I agree with conder101...rock tumbler with sand and dish soap I believe. Cant exactly remeber from my metal detector forum but I think thats how they clean dug clad coins. Try googling it in relation to metal detecting.
In addition to rock tumblers, there are machines for polishing ammunition brass. One type rotates like the rock tumbler and another one vibrates. The polishing medium is often crushed walnut hulls. Possibly available used at a local gun show or with a call to the local shooting club.
I don't know of a service that does this but a vibration or sonic cleaner helps. I have one in my lab at work that I can use when it isn't being used for cleaning machine parts. It cleans the loose gunk but if it is stuck together on a molecular level, I haven't had any good results.
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