I have found a great way to clean clearos. This includes x2, nano, t3 and new t4. Just open them up and place all components into a coffee mug with medium to hot water. Place a polydent denture cleaner tab in and let it soak overnight. It completely cleans the wicks, plastics and coils and makes them good as new. Doing this, I'm still using the same t3 heads that are over 6 months old and I cape about 6 ml a day