You could also just put them in a rock tumbler or small mortar mixer and add aquarium gravel and soap should do the trick. Ice
Well, All I can think of is getting a kiddie pool, a bunch of copper cleaner, and something to "mix" it with. Seems pretty logical to me. Please post pics of this floor when it's finished, I'd love to see it. ~Mizozuman2~
I just think the Cement mixer idea is always worth reading, although there was another one i couldn't find that was funnier where someone asked how he could clean 5 buckets of coins that fell in tar or something, and someone suggested using a cement truck as sand, and i nearly fell off my chair in laughter. I couldn't find that post.