You need to use shampoo. Shampoo does the trick because it's a mild degreaser for hair, and also cuts through poop stink for the same reason: degreasing.
The reason poop stank is so persistent is because human feces passes large quantities of oils and fats, which are the really messy aspect of poop. The stench is embedded in the non-evaporative oils and grease, and comingles with the oils from the sebacious glands of your skin. To cut through that stink, you need to chemically strip the oils that retain the aromatic grossness.
Dish soap works too, but it really isn't designed to be skin friendly or have cosmetic appeal. Dish soap is stronger, and you don't need as much, which makes sense. Dish soap is intended to destroy food baked onto pots and pans, which is tougher than what your gastric juices do to food.
Shampoo isn't as strong as dish soap, but the right kind will destroy any odor, and it's easier on your skin than dish soap.
The reason poop stank is so persistent is because human feces passes large quantities of oils and fats, which are the really messy aspect of poop. The stench is embedded in the non-evaporative oils and grease, and comingles with the oils from the sebacious glands of your skin. To cut through that stink, you need to chemically strip the oils that retain the aromatic grossness.
Dish soap works too, but it really isn't designed to be skin friendly or have cosmetic appeal. Dish soap is stronger, and you don't need as much, which makes sense. Dish soap is intended to destroy food baked onto pots and pans, which is tougher than what your gastric juices do to food.
Shampoo isn't as strong as dish soap, but the right kind will destroy any odor, and it's easier on your skin than dish soap.