You could just fast for a day... That'll empy out your colon! Only drink water... I think that's the best way to do it... You shouldn't try too many weird formulas as they could worsen your condition or irritate your digestive system. Starving for several hours is the best way! Your body naturally cleanses itself, you live for 80 years, it really doesn't need stimulation IMO. Even if your body is really messed up, I recommend not further irritating it.