I've never personally vaped AC/AFB, have some on the way in my latest order.
Menthol flavors are also notoriously stubborn to get out of an atomizer, however I've found the Atty Resurrection Method posted by highping in the Tips & Tricks section to not only work as claimed but also remove all traces of previous liquid.
Isopropyl alcohol gets almost everything out of carts/filler.
Of course you probably don't want to go through with all that every time you switch juices.
Menthol, like cinnamon, actually seems to enhance most juices. So it's not the end of the world if you get a little unintended blending.