When we fast, peristalsis ceases and there is no way to remove those toxins other than with an enema. Same with a cleanse. Yes, you are ridding your organs of gunk, but that gunk, at least most of it, will remain in the colon until we do something to get rid of it.
If we fast or detox without the use of enemas the toxins, heavy metals, worms and other lovelies will just reabsorb back into the body.
Many people advise an enema every day of a cleanse or a fast. Some advise one in the morning and one before bed.
The two videos below demonstrate how to properly do an organic/distilled water enema.