Soap pods have a variety of, different ability to remove dirt. Tang early "new cultivation of materia medica" records: "pig's teeth soap pods the most under the shape of the curved hostile thin evil, all no nourishment, wash dirt does not go", should be selected "thin skin succulent ...... flavor big thick" 's, so the later generations have "soap" or ' "soap pods" word to call the quality of meat thick soap pods, meaning "meat more fat soap pods ". The Ming Dynasty Li Shizhen "Compendium of Materia Medica" cloud: "soap pods ...... October pods, boiled and pounded, and white flour and incense for pills, bath body face dirt, and greasy better than soap pods also". This can be seen, soap pods are really play a role in decontamination.