On reading your post, I immediately googled "Vitamin B5" to learn more about it and was returned alongside the typical deficiency info some warnings against its overdose, which may result in "Edema, severe fatigue, joint pains, reduced protein metabolism, gastrointestinal symptoms, raised VLDL triglycerides, calcification, dehydration, depression"(http://www.acu-cell.com/bx2.html. So I think people may need to take cautions if they want to try it as a cleanser.
Anyway, I think your post is very interesting. It'll be just great if some inexpensive, readily available pill turns out to be a mucoid plaque buster.