Later people did claim this but that is not supported by internal evidence.
 Shower once. Wash with soap. Rinse. Soap Again. The idea of doing this twice is that there is some layer of grease that does not come off until one has soaped twice
 Gravity. My wife discovered this amazing thing in child birth.. If you are a woman, don't lie down for child birth but remain standing as long as possible. Gravity helps immensely to make the process short and easy.