Dice57 is right
...pull the wick, dry burn coil, re-wick.
when I pop the cap off if its all dark, Ill run a toothpick around the inside of the base (where the coil is) and rinse, then just re-wick with organic cotton.
Once you comfortable re-wicking, the next step is to order up some NR-R-NR coils from FT and you can just rebuild. Re-wicking takes all of 30 seconds.