With so many candles available for the home today, the allure is not only in the wide array of different scents and colors, but in the decorative jars that they come in. When the candle is all snuffed out for the last time, there is usually some residual wax in the bottom of the jar that won't budge. If you're wanting to save the jar now that the candle is gone and need to remove the wax, there are several proven methods to help you in this endeavor.
Place the jar in the microwave and let it warm up for about 30 seconds. This will melt the wax enough so that you can use a putty knife or butter knife to easily pop the wax out. You can usually knock the jar on something and the wax will come out on its own with no scraping required.
Place the jar in the freezer for about 1 hour. The frozen wax will be very easy to pull away from the jar with a butter knife.
Place the jar in the sink, and pour boiling water into it. The melted wax will float to the top. Let it sit until it has cooled. The wax will now be sitting on top of the water and can easily be removed.
Set the jar in the oven on a low heat, no more than 200 degrees F. When the wax is completely melted, pour it out into a designated container or onto a piece of wax paper to be discarded when it's cool enough to throw in the trash. Wash out any residual with soapy water before it can cool.
Run hot tap water from the faucet into the jar, and let it soak for a few minutes. It should dislodge easily with a butter knife.
To get rid of any residual candle smell in the jar, pour vinegar or baking soda--not both--into the jar and let it sit overnight. Wash it with warm, soapy water in the morning.
Wear oven mitts if you heat up the jar to avoid getting burned.