In a bubbly report for Vox, producer Madeline Marshall shared exactly why viruses of any and all kinds are no match for washing with plain old bar of soap. Soap has specific amphiphilic properties that attach and completely annihilate disease-ridden molecules.
Marshall explains that viruses are surrounded by a layer of fat, as Alton Brown previously demonstrated. This layer of fat cannot be washed off with just water as the two substances don’t mix. The addition of soap not only cuts through the two and creates a potent emulsion that washes away the virus for good.