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I put mine in a plastic bag, once I get enough saved up I grate them up real fine, put it in a container the size of a new bar or so, slowly add hot water till fully saturated, DONT STIR IT!! or...

I'm thinking the oils in the soap have dried out at the surface, being that its so small.
Kinda like a bar of soap does in the shower. When you first started using it, it lathered real well, but...

Well that is different, I've not had that problem as of yet.