To clean out a tank or clearo for a new flavour, my choice is to use a 50-50 mix of glycerine and vodka. Put it in a small 5ml dropper bottle, and drip a few drops into the empty tank, then shake that out / blow it through as appropriate, repeat, and you're good to go.
Refill the tank, dry pull the new flavour into the coil/wick cartridge (draw without firing it), then vape. The first couple of draws will be a bit light on flavour, then it comes through fully. vaping the glycerine/alcohol/water mix has no implications. Vape it on low power at first, if you have a choice of volts/watts, then ramp up to normal.
Refill the tank, dry pull the new flavour into the coil/wick cartridge (draw without firing it), then vape. The first couple of draws will be a bit light on flavour, then it comes through fully. vaping the glycerine/alcohol/water mix has no implications. Vape it on low power at first, if you have a choice of volts/watts, then ramp up to normal.