Chef Soap Magically Removes Strong Odors From Hands
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 for a fisherman or chef friend of yours.