The cleanness of the body indicates to the cleanness of the mind. The cleanness of the mind is called “truth,” where no falsehood is involved. And not everyone is equal in that: some are partially meticulous. But the cleanness of the body is not so important to preserve, since the dirt that we so loathe is because the dirt is considered harmful, and we should keep it from harm.
Hence, with the body, it is not so important to be meticulous, since it will finally be canceled, even if we watch over it with all kinds of cares. But with the soul, which is an eternal thing, it is worthwhile to be meticulous with all kinds of cares, to avoid any kind of dirt, since any dirt is considered harmful.