thank you classwife I couldn't find the tanks section and I got tired of looking.
I don't clean it, no. I mean some flavors WILL bleed into the wicks and stay there for a while, but I usually don't have a big problem with that. For instance, right before I went to sleep last night, I dripped dragon fruit onto the coils of my vivi nova with a mixture of around 35% Dekang TAB, and 65% Malty. Malty is an extremely light, almost flavorless juice. I had a quick vape, maybe 5-10 hits, went to sleep. I wake up this morning and I've got caramel dragon fruit in my wicks lol. It lasted 2-3 vape sessions. So if your not one to be ok with flavors bleeding together, you can't drip a stronger flavor with a lighter one in the tank.
Basically, you drip a flavor into the coils, and it tastes like that flavor for the most part. You don't get the tank's flavor at all. But then it can start bleeding together as your wicks pull more juice from the tank. Then, the flavor you dripped gets replaced. Its not a bad way to drip and the vivi novas give you monster hits when your dripping. Very impressive when I drip into mine. You could theoretically have nothing in your tank and use 1 of your novas as a dripping atty honestly. Then no flavors would bleed. not bad.