If you are using similar liquids the flavor doesn't leak much from what I have had. Most of my liquids are "fruity" vapes, usually I just vape till the tanks empty, it wicks all the way down really well, do a couple low watt puffs, haven't burnt dry yet, but the coil holds over half a ml so a couple puffs isn't taking much. Then take the coil out, wrap it in paper towel while I rinse out the base and glass, a quick set on the paper towel, shake them and put it back together, drip some straight into the coil, and fill your tank up, and within 5 puffs the old flavor is gone.