Hi Felix,
We're glad to help! To clean the tank section of the Joyetech eGo AIO, you can fill the tank about 3/4 full with water, vodka, or rubbing, or isopropyl alcohol, put your thumb over the opening and shake it, then dump it out and rinse the tank section. The rest of the parts can be wiped or rinsed as needed.
Best regards,
Brad