Stainless steel has magical deodorizing/odor neutralizing power that can wipe the pungent scents from things like garlic, onion, and fish away from your skin. There isn't a clear chemical explanation for this, but it's been hypothesized that sulfurous compounds are somehow catalyzed by the steel. So, some clever entrepreneur came up with a stainless steel "soap" product, essentially a block of metal in soap shape, to rid your skin of whatever stink ails you. 
But rubbing your hands across a stainless steel knife, spoon, or other utensil will have the same effect. Knowing that you can you use any old piece of stainless steel is certainly a deterrent from purchasing a bar of the soap, but I think it makes a good gag gift (or stocking stuffer!) for a fisherman or chef friend of yours. Luckily, the Uma Stainless Steel Soap ($8, reduced from $12.50) is on sale.
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I think it's cool. I remember a friend of my mom's told me to rub the kitchen faucet after chopping onions or garlic. I was amazed at how it worked to rid the smell off my hands.
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