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How to remove wax from glass
Place the glass jar or piece of glass in your freezer.
Freezing works best for small votive holders or candle jars. Once your candle has cooled to normal room temperature, place it in the freezer.
If you put it in when it's too hot, you'll risk cracking the glass from too quick of a temperature shift. Make sure the glass is cool to the touch before you freeze it.