Soap is a recurring theme in Severance.

Mark: Do you want Graner to use the bad soap?
Helly: There’s bad soap?

In Perpetuity (22:29)

Lumon began as a salve company and then moved into medical devices and technology. They still make their own soap, a heavy, viscous goo of a bright green color reminiscent of Palmolive with a gelatin thickener. That is the good soap that is refilled each morning by the Senior Refiner. There is also the bad soap which is used by security personnel on Severed employees who have misbehaved. You don't want them to use the bad soap.

Some think that the topical application of the soap enhances the compliance of innies, but there has been no overt description of compulsion to use the soap regularly. As Irving points out, the soap dispensers are not labeled, though everything else in the innie universe is. Perhaps that means that the label “soap” is disingenuous?