When your favorite candle burns down to the bottom, that heavy glass jar still has plenty of life left. Clean the leftover wax out and it becomes a free planter, a bathroom organizer, or the vessel for your next candle pour.
The wax type decides how hard the job is. Soy melts around 120 to 180 degrees Fahrenheit and stays soft, so it loosens and pops out with little effort. Harder paraffin, which fills most store-bought candles, melts around 115 to 154 degrees Fahrenheit and clings a bit more, but the methods below work on both (1).
Here are the easiest, low-mess ways to get a candle jar clean and ready for a second life.
Key Takeaways
- Freeze it out: Chill the jar overnight so the wax shrinks away from the glass, then pop the puck out with a dull butter knife.
- Or float it out: Warm the glass, pour in near-boiling water, and the melted wax rises, cools into a disk, and lifts off the top.
- Clear the residue: Wash with hot, grease-cutting dish soap, and loosen sticky label glue with cooking oil or Goo Gone.
- Never drain the wax: Pour melted wax into the trash, never down the sink, or it hardens and clogs the pipes.
How to Get Wax Out of a Candle Jar
Before you can repurpose a jar, you have to remove every bit of wax. It is normal to have about 1/2 inch left at the bottom. The National Candle Association recommends you stop burning a container candle once about 1/2 inch of wax remains (2), so the flame never reaches the bottom or sidewall, which is exactly what overheats the glass and makes it crack.
Here are the most effective methods to remove that leftover wax.
The Freezer Method
Cold temperatures cause wax to shrink and pull away from the glass. This is often the cleanest method for removal.
Pop the candle in the freezer and leave it there overnight. When you take it out, the wax should be hard and slightly shrunken. Use a dull butter knife to gently pop the wax puck out of the jar. It often comes out in one satisfying piece.
Use your knife to pop the metal wick tab off the bottom. If there is sticky residue left, don’t panic. We will scrub that out later.
The Boiling Water Method
This technique uses heat to displace the wax. It is great for jars with narrow mouths where you can’t reach the bottom easily.
Boil water in a kettle or pot. Set the jar on a heat-safe surface like a tea towel or trivet. Warm the glass first with a splash of hot tap water, then pour in the boiling water, leaving about an inch of space at the top. Skipping that warm-up can crack a cold, thick jar from thermal shock. This float method works on soy, paraffin, and beeswax alike.
The boiling water will melt the wax, causing it to float to the surface. Let the jar sit until the water cools completely. The wax will harden into a disk at the top of the water. Simply fish it out and toss it in the trash.
Pour the water out (not down the drain if it still has wax flakes!) and wipe the inside with a paper towel.
The Oven Method
If you have several candles to clean at once, the oven clears them all in one go.
Preheat your oven to 200 degrees Fahrenheit. Line a baking sheet with aluminum foil or parchment paper to catch the mess. Place your candle jars upside down on the lined tray.
Let them sit in the oven for about 15 to 20 minutes. Gravity will do the work as the melting wax drips onto the foil. Once the jars are clear, use an oven mitt to remove them. While the glass is still warm, wipe the inside with a paper towel to remove residue.
Safety Warning
Glass can break due to thermal shock. Never put a cold jar directly into a hot oven, and handle the hot jars with thick oven mitts.
The Double Boiler Method
If you make your own candles or want to save the wax for wax melts, use a double boiler.
Fill a saucepan with water and bring it to a simmer. Place the glass candle jar directly into the water. Ensure the water level isn’t high enough to splash into the jar.
As the water heats the glass, the wax will melt. Once it is liquid, pour it into an old tin or the trash. Use a butter knife to pop the wick tab off the bottom while the glue is warm.
Fun Fact
This method mimics how professional candlemakers melt wax. It ensures the wax doesn’t burn or catch fire from direct heat.
Using a Hairdryer
You can spot-clean a jar using a hairdryer. This is great if you just need to soften the wax slightly to scrape it out.
Hold the jar with an oven mitt (glass gets hot fast). Aim the hairdryer at the sides and bottom of the jar on high heat. Once the edges of the wax soften, use a butter knife to loosen the chunk and dump it out.
Wipe the liquid residue away with a paper towel. Be careful not to blow air directly into the liquid wax, or it might splatter onto your clothes.
The Microwave Method
You have to be extremely careful with this method. Most candle wicks are attached with a metal tab. Metal causes sparks in the microwave, which can shatter the glass or start a fire.
Only use this method if you are 100% certain there is no metal in the jar.
If safe, place the jar in the microwave for 30 seconds at a time. Check it constantly. Heat in short bursts and stop as soon as the wax liquefies, so it never overheats and cracks the glass.
Using a Heat Gun
A heat gun is faster and more powerful than a hairdryer.
Set the jar on a heat-resistant surface. Aim the heat gun at the outside of the jar to loosen the wax bond. Once the edges melt, the wax clump should slide right out.
Wipe the jar clean immediately. Always wear gloves, as a heat gun can make glass scorching hot in seconds.
The Spoon Method
If you don’t want to use heat or water, grab a sturdy spoon. This requires a bit of elbow grease.
Simply chip away at the soft wax with the spoon. This works best with softer waxes like soy or coconut blends. Avoid using sharp knives, as they can scratch the glass or snap and injure you.
Acetone or Nail Polish Remover
This isn’t for removing the bulk of the wax, but it is perfect for that last thin film of grease.
Soak a cotton ball or paper towel in acetone-based nail polish remover. Rub the inside of the jar. The acetone breaks down the oils and wax instantly, leaving sparkling glass behind.
How to Remove a Whole Candle From a Jar
Sometimes you buy a candle, and the scent just isn’t for you. You can remove the unburned candle intact and reuse the jar.
The freezer method is the champion here. However, this only works well for straight-sided jars. If the jar has a narrow neck (like some apothecary styles), the wax won’t slide out intact.
- Place the unlit candle in the freezer for at least 4 hours, preferably overnight.
- Remove it and turn the jar upside down.
- Give the bottom of the jar a firm tap with the palm of your hand. The wax candle should slide right out.
- If it sticks, use a butter knife to gently break the vacuum seal between the wax and the glass.
You can now wrap that wax in tissue paper to gift to a friend or place it in a wax warmer.
How to Clean a Candle Jar
Once the chunks of wax are gone, you are usually left with a greasy film and soot marks. Here is how to get that glass crystal clear.
- Time: 20 minutes
- Difficulty: Easy
What You’ll Need
- Hot water
- Dish soap (grease-fighting)
- Scrub sponge
- Dish towel
- Rubbing alcohol or vinegar
- Cooking oil or Goo Gone
1. Remove the Wick Tab
If the metal tab is still stuck to the bottom, it is likely glued down. Pour a little hot water over it to soften the glue, then pry it up with a spoon or butter knife.
2. Clean the Adhesive
There is usually a label on the jar and glue residue on the bottom. The best way to remove sticky glue is with oil.
Saturate the sticky spots with cooking oil (olive or vegetable) or a product like Goo Gone. Let it sit for 10 minutes. Scrub it with a sponge, and the glue will roll right off.
3. Wash With Hot Soapy Water
Fill the sink with hot water and plenty of dish soap. You need a soap that cuts through grease since wax is oil-based.
Scrub the inside of the jar thoroughly. If there are black soot marks near the rim, a little rubbing alcohol on a paper towel wipes them away instantly.
4. Dry Thoroughly
Dry the jar with a lint-free dish towel. If you let it air dry, you might get water spots. Your jar is now ready for its new life!
Top Ways to Reuse Candle Jars
A clean candle jar is basically a free storage container. Here are a few favorite ways to upcycle them.
- Planters: Glass jars make beautiful homes for succulents or propagating plants. Just remember to add rocks at the bottom for drainage since jars don’t have holes.
- Bathroom Organization: They are the perfect size for cotton balls, Q-tips, makeup brushes, or hair ties.
- Desk Storage: Keep your workspace tidy by using jars for pens, paperclips, or thumbtacks.
- Pantry Storage: If the jar has a lid, use it for loose-leaf tea, spices, or homemade salad dressings.
- Regifting: Fill the jar with candy, wrap a ribbon around the neck, and you have a cute, low-cost gift.
- New Candles: If you are feeling crafty, buy some soy wax and wicks to pour a brand new candle in your reclaimed vessel.
How to Reuse Old Candle Wax
Don’t toss those scraps of wax! If you save enough of them, you can create a “franken-candle.”
- Time: 1 hour
- Difficulty: Intermediate
What You’ll Need
- Old wax scraps
- Pre-tabbed wick
- Clothespin or pencil
- Clean jar
- Double boiler
- Hot glue gun
1. Prepare the Jar
Make sure your jar is clean and dry. Use a dab of hot glue to stick the metal wick tab to the center of the jar’s bottom.
2. Melt the Scraps
Place all your wax scraps into a double boiler. Melt them down slowly. Be aware that mixing different scents can result in some interesting (or funky) aromas.
3. Pour and Set
Once melted, carefully pour the wax into your prepared jar. Use a clothespin or wrap the wick around a pencil to keep it centered while the wax cools.
4. Trim the Wick
Let the candle cure overnight. The National Candle Association also recommends trimming a wick to 1/4 inch before each burn to keep the flame low and even, so trim it to that length before lighting.
FAQs
The Bottom Line
Match the method to the job. For a single jar, the freezer method wins: a few hours or an overnight chill and the wax puck usually pops out in one piece with no heat and no mess. When you have several empties to clear at once, the oven method is faster overall, since you can set a tray of jars upside down on parchment and let them drain together while you do something else.
Once the jar is clean, you have two easy payoffs. Save the leftover wax scraps to melt down into a new candle, and turn the empty glass into a small planter, a brush holder, or a desk caddy for pens. When a jar is finally past reuse, remember that clear and colored glass is widely recyclable once every trace of wax is gone.
