Aunt Peaches: How to Remove Candle Wax From Glass Containers. It works! I used it to remove wax from crystal candlesticks but instead of adding boiling water for 15 minutes, I just dipped a paper towel in the boiling water and held it against the wax on the candlestick. After 30 seconds, the wax came off! And there was no damage to the crystal.
How to clean out candle wax to leave a clean glass vessel...... 1. Pour boiling water into the jar. 2. Leave it overnight. ie. wait for the water to cool completely. 3. next day, the wax will float to the top and harden & you can then pop all the cold wax out, dump the cold water and wash the jar in warm, soapy water – and be done. (Yellow Brick Home)