Hi,
You can rinse the tank/pod after removing the coil. DO NOT RINSE THE COIL.
Hot water and a bit of shaking should remove most of the previous flavor. Dry the POD/tank as completely as possible before inserting a coil or filling with e-liquid.
If reusing your current coil, the flavor of the old juice will linger for a tank or two, but will also become less noticeable over time; nevertheless, the original flavor may not go away completely.
If changing flavors often, having multiple pods/coils may prove to be convenient.
HTH
I