Just wanted you to note that I mentioned the Christopher as a 'type' of cleanse, but I just happened to do it after reading the little booklet.
Barefoot's not back from vacation yet, but I would venture to guess that while the prune juice is cleansing, it wouldn't have the same effect as the epsom salts flush as far as removing the mucous. (and you don't have to do a 40 day fast, especially for the first one. It almost sounds like you're thinking the Christopher fast is the only 3 day, but you can do a 3 (or 6, 10, 14 for that matter) using Hay's or MH's version.
Just try, and see what you are comfortable with.