With light juice flavors I also just run the tank dry and refill with new flavor. With strong or dark flavors I will disassemble, clean, dry burn and rewick. I also use rayon. With cotton I would rewick with every flavor change.
I Pop the Tank - assembled - off the Base
Rinse under hot water and Dry with paper towel
Remove Chimney sections and rinse
Remove wick - Easy if rinsed first and rolled to remove
Dry burn to kill old flavor on wick and clean
Rinse coil
Dry burn to remove water
Wick
Soak with e-liquid
Install Chimney
Test Vape
All Good - install tank - Fill
Takes all of 5 minutes or so
If a new flavor is similar to what was in the tank, I'll just refill. I only rewick when I need to.