I must say, I have been meaning to add to that article, even make some changes based on further case studies and experiments. But to your question.
You want a mild soap. While I am still researching the science behind this, the gentleness of a soap is more affected by the choice of oils used. So claims of pH balanced etc. often are misguided assurances. That is because the vagina has a pH between 3.5 and 4.5, the human skin has a pH between 5 and 7 and none of that matters because the rectum has a pH of 7 to 8. That is to say that any ordinary soap is more likely to have a pH closer to the pH of the rectum/colon that a soap that is “pH balance” for human skin or women’s pussies. ( sic:- UNC Pharmacopedia – Rectal and Vaginal)
Down to specifics. One product that is very good is [FemFresh][http://www.femfresh.com.au/FemFresh_Intimate_Wash]. This is an Australian product but other global soap maker will have an equivalent. Ignore the comments about it having a high pH (that is standard for soaps). The important statement is *”The hypoallergenic formula has been dermatologically and gynaecologically tested…”* and I can vouch for the products gentleness when it comes to the anus and rectum.
[Castile soaps][http://en.wikipedia.org/wiki/Castile_soap] are heralded by many enema enthusiast and I have to agree with them. Dr. Bronner (Another Australian product but use all over the world for enemas and therefor I must assume available all over the world) makes a range of [liquid Castile soaps][http://www.drbronner.com.au/liquidsoap.html] with different essential oils added. The scent helps to neutralize the inevitable smell that accompanies the total colon clean out. Stay away from the astringent oils like peppermint, citrus and Eucalyptus (some love it but they like astringent agents up their ass). To keep things soothing, so you can use your anus and rectum of other activities without waiting for the irritation to pass, use lavender, baby mild or Rose. Dr. Bronner’s is great because it is highly concentrated so you only need a few drops (6 – 10) in a litre of water.
Finally, baby shampoo. Truely! It is readily available and dirt cheap. Basically any “No More Tears” formulation. If it won’t irritate a baby’s eyes it is not going to irritate the anus or rectum. I got DirtyGardenGirl onto this. She is one person who cannot afford to have chemical irritating her ass just before a performance.