Don't worry, then. Several of those are non-soluble and could look like dirt, expecially the Pau d'arco (which is a bark), burdock root and walnut hull.
Didn't mean to insult you with the alcohol question, but we did have someone on here once who was going to use isopropyl. It's our job here to protect each other. :) Most people have better sense, but he figured that it was only a couple of drops, so it wouldn't hurt.