I have this cousin (currently doing 10 years in prison for robbing people while he was high on Xanax) who had a hardcore way of cleansing his system if he had to take a piss test. He would take a very small piece of paper towel, roll it into a ball, dip it in bleach, and swallow it. It would make him piss almost nonstop and it was so strong you could smell it in the other room. Shit smelled like straight bleach. I thought most people did this but apparently they don't. Btw I don't advocate it.