If you’re comfortable working with melted wax and plan to reuse it, the double boiler method is an excellent choice. Create a double boiler by placing a heat-safe bowl or pot over a saucepan of ...

Boil a small pot or kettle of water. If there's still more than a centimeter or so of wax left in the candle, use chopsticks or skewers to poke holes in it. Pour the boiling water into the candle.