The shape of a soap bar is purely decorative, any piece of stainless steel, such as a spoon can be used for the same purpose.
In the absence of plausible chemical explanations of why this may work, or experiments using controls, it is unknown whether the stainless steel soap is actually effective. Stainless steel soaps are often advertised for use in conjunction with water; it is likely that sulfurous compounds either dissolve directly in the water or (less likely) are catalyzed by the steel, if indeed the odour removal is measurably greater with stainless steel than any other substance.
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