You can dry burn (pulsing the fire button about 3seconds at a time and pausing between fires to let it cool down) wicks that won't catch fire to get the juice off of them and change flavors as mentioned above. You can also remove the wick, and dry burn the coil in the same way to remove the juice buildup that gunks up your coil after some time. I do this every time I change a wick in order to make my coils last longer.