If you're eating the right foods, you shouldn't need a colon cleanse. You should be naturally moving your bowels several times a day.
If that's not happening, then something is "out of balance" with your diet. You need to correct that imbalance. It may be something as simple as too little water in your diet- or you may need more magnesium, or more fat. You may need to add in blood type specific probiotics and/or fermented foods. You may need more fiber, or you may need less fiber- the key is to find "the right amount" for your body. Some people who have been using fiber supplements to help with constipation find that the problem clears up when they stop the supplements.
Harsh cleanses may or may not be appropriate when first starting out, if you've been eating a very toxic diet in the past. But cleanses will wash away good germs along with the bad ones, and you then need to rebuild your gut ecosystem. Once you've been on BTD for a while, you don't want to undo all that gut healing with a harsh cleanse.