That something's obviously bunkum is not enough. Science must be done!
National Public Radio's Sarah Varney, and her husband unit, each took a Kinoki footpad and applied it to the soles of their feet at bedtime. As expected, by morning each was saturated with the nasty brown gum prominently associated with these "cleansing detox foot pads." The makers claim it comprises toxins and metals leached out of your body by the pad. So it was off to the lab with the used Kinokies, along with a fresh one for use as a control.
The verdict: Scam! While the used pads contained some grody elements, they were already present in the unused ones. All samples appeared to be identical, as far as toxicity was concerned. But what of the fecal fondue? Whatever it is, it's activated by any moisture, even by holding a pad over a boiling kettle.
Update: Commenter Bat21 points out that ABC reporter John Stosser already did the Kinoki-debunking legwork a while ago.