Stainless steel soap is just that: the use of a slab of stainless steel for cleansing purposes — although it isn't very soapy.
That it doesn't actually work at all is, of course, no barrier to its adoption.
It seems likelier that any effects from the stainless steel soap are actually due to the actions of running water and friction, and that a chunk of rubber, plastic, or something similarly solid would yield comparable results.
Currently, the product does not seem to have been tested with any rigor, but an anecdotal report from a chemistry professor is negative, as are most reports from professional news outlets.
 Comparison with actual soap
Regular old soap is a metallic salt (usually sodium or potassium) of a fatty acid. The alkali metal ions released when it dissolves in water are even more chemically active than iron or chromium, and will bind sulfur more readily.
Of course, the other point of traditional soap is the detergent quality that arises from its combination of organic acids with inorganic ions, resulting in a product that allows normally insoluble oil and grease to emulsify more easily with water. Stainless steel soap lacks these detergent properties.
Given the theory of its operations, that metals in the stainless steel bind sulfur and reduce odors, it would appear that silver might make an even more effective "soap" substitute, since silver's affinity for sulfur is strong.
- Stainless steel soap does not melt or dissolve in water nearly as quickly as conventional soaps. It's probably safe to say that one bar will last a lifetime.
- If you've ever run out of dishwasher soap and attempted to run the dishwasher using ordinary dish or household soap, you know what a mess that can make. Stainless steel soap does not cause this problem.[notes 1]
- If it happens to slip down the garbage disposal, you'll know instantly.
- Endorsed by the Stainless Steel Rat.
- Can be used to defend oneself if ever attacked in the shower — though this might count as use of deadly
- The "soap on a
chainrope" version doubles as a medieval weapon.
- If your house ever gets hit by a jet airliner, rest assured that the government is lying if they report failing to recover your steel soap unharmed (since jet fuel can't melt steel soaps).
- If lost, can be found with metal detectors.
- Vegan friendly, maan!
- Can be made out of recycled materials.
- Holds an edge better than most other brands of soap; perfect for making a shank if you're in prison. Assuming you can sharpen it — if not, just dumping the bar into a sock and spinning it is likely the way to go.
- No risk of soap drop, because it's not the least bit slippery — even in water.
Because it's not actually soap! WAKE UP!!
- It doesn't work.
- Liquid form irritates skin badly.
- Not recommended for soap carving (unless you
are on aciduse acid).
- Will hurt if you drop it on your toes.
- Can't be used to make soap bubbles.
- Poor lubricant.
- Doesn't really suds all that well below 1370 degrees C (2500°F).
- If you catch your kids using their pottymouth, they might need their mouths cleaned with soap and water — just remember that, if using this soap to do it, your children will also need dentures.
- Does a Bit of Steel Get Rid of That Garlic Smell, NPR
- What is Stainless Steel Soap, wiseGEEK
- Stainless steel soap, New York Times.
- Stainless steel soap, Australian ABC, audio.
- ↑ What? It isn't like anything like this would have ever happened to me.