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.
Alternatively, you could heat the jar while you’re doing the dishes. Run some water and get it as hot as you can stand, then soak the jar for a while at the bottom of the sink. Another option is to heat the wax on the jar using a hair dryer. Turn the hair dryer on medium and blow the hot air over the wax until it melts. [3] X Research source If you have multiple jars to remove wax from, try placing them into the oven at 180 °F (82 °C). Place the jars on a foil lined baking sheet and put them into the oven for about 15 minutes to melt the wax. [4] X Research source
Alternately, you can use a fork to separate smaller chunks of wax, or skip this step completely if only a thin coating of wax or residue remains in the glass.
Spraying the jar with ammonia, such as window cleaner, will also help to get rid of any remaining wax and residue. [6] X Research source Let the ammonia sit on the glass for about 1 minute and then wipe it away.
Alternately, you can spray glass cleaning solution on the wax and clean off using a paper towel or soft rag. It might take several passes before you get it up completely. Be diligent!
