People just want some kind of magical cleanse, or pill to cleanse their bowels. In more extreme cases they will go for an enema/colonic.
They do not realise that health of their intestines, liver is compromised and these kind of cleansings will not eradicate the root cause.
Exercising the abdominals, improving the flexibilty of spine will cleanse the bowels automatically. It will also increase the peristalsis of the intestines, which is further compromised in their bodies.
Eating normal dosages of flaxseeds and other natural fibers is fine to cleanse the colon, but dont forget the power of exercises/sretches. They are a must to keep things moving in the body.