It's best to freeze the jar for a few hours. When the wax sets, it should shrink a little and often comes off with a little pressure from a butter knife or spoon. If there is still wax left over, pour hot water into the jar to melt it and lift it out. Then, wipe it clean. To keep the jar from cracking, don't put it straight on open flames or boiling water.
Wash the jar with warm water and light dish soap after taking off the wax. Mix vinegar and baking soda together to break down any soot or scent that is still there. Use a soft sponge to scrub it, then rinse it well and let it dry all the way through. If you want to use the jar again, make sure there is no wax or wick base left over.
Yes, you should always put pillar candles on a plate or stand that can handle heat. They are made to stand on their own, but they melt from the middle out and can become unsteady. A good handle will catch melted wax, keep surfaces from getting damaged, and lower the risk of fire. For safe placement, look for holders that are the same diameter as the light.
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