Once the candle had finished burning, I let it cool. Then, I put it in the freezer for a few hours. This allowed the remaining wax to separate from the glass and thus make it easier to clean. After it came out of the freezer, I used a knife to pop the wax out of the container and then let the container come to room temperature. Then I filled it with hot water and let it soak for a few minutes. This allowed any remaining wax to melt off the bottom and sides. Then I dumped the water and wiped it clean with a paper towel. Voila!