I used to put the glass votive candle holders in the freezer to 'pop' out the old candle wax and that works, but I have found a much easier way.
I run about 1 teaspoon of water into the glass votive holder from the faucet, then put it in the microwave for 1 minute. Microwaves vary, so run it long enough to completely melt the old wax. Be careful, it gets very hot!
When it's just cool enough to handle, I simply take a paper towel and wipe it out dry. You're done. You don't even have to wash it because it comes out so clean. Obviously you cannot put a metal votive in the microwave, so the freezer is still a good idea for those.
By Patty from East Peoria, IL
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To remove the candle wax, left over after burning a candle, I put the container in the freezer. When the wax is frozen, it's easy to pop loose leaving the container practically clean.
The lady who is responsible for cleaning the glass candlesticks on the altar at our church amazed me when she put the candlesticks, which were covered with hardened wax drippings, into the freezer at church. When they were very, very cold, the wax just popped right off.