What kind of tank do you have? Not that it matters much. You can break the tank apart and clean it, then either change the coil, or wash the old one and let it dry completely before reuse. Then reassemble, fill with the new
juice, and go. Using an RTA is even easier: clean the tank, pull new wicks, and reassemble. FWIW, I never did, myself. Just vape it empty and refill with the new juice. The flavor will be "interesting" for a whike, but the new juice will break threw in a few dozen hits. That might nit work against menthol. Menthol is strong.