I've done 19 liver-flushs and nearly always followed the Hulda Clark protokoll, that means the simple Epsom Salt and Olive-Ol/grapefruit-juice thing. Before one flush I drank apple-juice one week - haven't done it a second time. Ande one time I took Chanca Piedra in preparation and haven't done so a second time eihter. Just the simple Hulda-Clark protokoll works well.
Have you done enemas?
That is what I do before and after each flush. And if your skin is in such a bad shape it might be that your gut is n a bad shape too.