Although I take it that this was meant to be a flippant response, car washes rely on high pressure water blasts to clean caked on dirt and grime in the irregular recesses of cars (like the license plate well), and one doesn't need to be an engineer and hydrologist to appreciate that these same principles of high pressure water blasts combined with soap apply with equal effectiveness to irregular recesses and cavities of the human body such as the anus and asshole and the surrounding crack.
In any event, this thread has all the information in it that anyone needs to apply to their daily hygiene. You just need to go out and do it.
A much more interesting topic is dental hygiene and how often one brushes, uses mouthwash and/or fluoride rinse and flossing frequency. My dentist friend peeked at MERB and asked me to remind everyone that a smelly ass doesn't cause anything to fall out of your body, but poor dental hygiene will cause you to lose teeth and he has seen it firsthand. So he told me to tell all of you that when you need to pay $6000 plus for an implant down the road because you spent more time preoccupying with asshole hygiene while ignoring dental hygiene, you will understand your priorities are fucked up. He also asked me why there was no thread on MERB about dental hygiene. He thinks you are all totally messed up.