I soak overnight in alcohol, then rinse very well, and soak overnight again in water. Dry it out for another day. I know it is a long process, but I have some 30s coils going on 4 months now. I have had them perform well for over a month with the same juice without cleaning, so I just started buying new ones. The IC 30s is, IMHO, one of the best clearos out there. Despite owning drippers, Kayfuns and a Nautilus, I still use mine frequently. It is that good.