I agree. Your body is made to cleanse and detoxify itself quite nicely. There's no need to interfere with that process.
A century ago, people believed that waste matter stuck to the inside of your intestines and became kind of little barnacles. Now that they can image the inside of your intestines, they have seen that's not the case.
I've seen the inside of my colon. Nothing sticking to it. But the colon cleansing to prep for the colonoscopy was not fun. Don't do it unless you're having a medical procedure that requires it -- that's my advice.
(I am due for another colonoscopy this year. Not looking forward to it. The procedure itself is not too tough, the prep is what I don't like.)