Your candle finished, and now there's a half-inch of leftover wax stuck to the bottom of a beautiful glass jar you'd really like to keep. Maybe for a planter. Maybe for organizing brushes. Maybe just because the jar itself is nice.
The good news: glass is the easiest surface to remove wax from. Three methods work, and they all leave the jar genuinely usable. Here's how to pick the right one.
Method 1: The boiling water method (fastest, easiest)
This is the move for jars where the leftover wax is more than a thin layer. It works because wax floats and water doesn't.
You'll need:
- The candle jar (with all wick metal removed)
- A kettle of just-boiled water
Step by step:
- Pull the wick base out of the bottom of the jar (small metal disc, comes out easily once the wax is hardened).
- Place the jar in the sink. Yes, sink, not counter. In case the glass cracks (rare with good-quality jars but possible).
- Pour just-boiled water into the jar, leaving about an inch of space at the top.
- Wait. The wax melts, floats to the top, and forms a solid disc as the water cools.
- After 30 to 60 minutes (depending on how much wax was left), lift the wax disc off the top of the water. It'll come out in one solid piece.
- Pour the water down a sink drain that's covered with a sieve or paper towel (to catch any remaining wax flakes — wax in drains causes clogs).
- Wash the jar with hot soapy water and a sponge. Done.
Important: don't pour the wax-water down a drain unstrained. Strain the water through a paper towel or coffee filter into the trash. Then run the water down the drain.
This method works on coconut soy, soy, paraffin, and beeswax. It's the gold standard.
Method 2: The freezer method (cleanest, no risk of cracking)
Use this when the jar is delicate, expensive, or has metallic detailing you don't want to expose to thermal shock.
- Remove the wick base.
- Place the jar in the freezer for 1 to 2 hours.
- Remove. Tap the jar gently against a folded towel on the counter (the towel cushions and protects the glass).
- The frozen wax will pop out as a clean disc, sometimes with a tap or two from a butter knife at the edge.
- Wipe the inside with a paper towel to remove any thin wax film.
- Wash with hot soapy water.
This method takes longer (waiting for the freeze) but has zero risk of cracking the glass and produces the cleanest disc removal. Good for vintage glass or jars you really care about.
Method 3: The double boiler method (for stubborn or thin layers)
Use this when there's a stubborn thin layer of wax that the freezer method won't pop out cleanly.
- Place the jar upside down on a small wire rack inside a baking pan.
- Set the oven to 180°F (or the lowest setting your oven allows).
- Place the pan in the oven for 10 to 15 minutes. The wax melts and drips into the pan below.
- Remove with oven mitts (the jar will be hot).
- Wipe the inside with a paper towel while still warm.
- Let cool, then wash with hot soapy water.
This is overkill for most jars but useful if you have multiple jars to do at once.
Removing the wick base
The small metal disc at the bottom of every wooden-wick candle is the wick sustainer. It's just glued in with a small amount of hot glue or candle adhesive.
Once the wax is gone (or before, if you're starting from a jar with leftover wax), pry the disc up with a butter knife. It comes out cleanly. Discard the metal piece and the small wood scrap that's left.
Cleaning off label residue
Most candle labels leave glue behind when you peel them. Two methods that work:
Goo Gone or similar adhesive remover: apply, wait 5 minutes, rub with a paper towel, rinse with soap and water.
Oil + baking soda: mix equal parts vegetable oil and baking soda into a paste. Apply to the residue, rub with a finger or sponge, rinse with hot soapy water. Works well and uses things you already have.
Don't use razor blades on the outside of the glass. Even on flat surfaces they can scratch.
What to do with the cleaned jar
Wick of Hope jars are designed to be reused. Some ideas:
- Small planter: add a layer of pebbles for drainage, then potting soil. Succulents and air plants thrive in candle jars.
- Brush or pen holder: on a bathroom counter or desk.
- Bathroom organizer: cotton swabs, hair ties, jewelry.
- Spice or dry goods storage: if the jar has a lid (most don't, but the matte lid sold separately fits).
- Tealight holder: drop a tealight in. Restart the cycle.
- Tea light + new candle: if you're crafty, you can pour fresh wax and a new wick into a cleaned jar to refill it. This is more of a craft project than a money-saver, but it works.
What not to do
Don't pour molten wax down the drain. Wax solidifies in pipes and creates clogs that need professional plumbing to remove.
Don't use boiling water on a cold jar straight from the cabinet. Thermal shock can crack the glass. Let the jar reach room temperature first, or use just-boiled water (slightly cooled, around 200°F instead of 212°F).
Don't use a microwave to melt the wax inside the jar. Many candle jars have a small amount of metal in the wick sustainer or are made from glass that's not microwave-safe.
Don't use sharp metal tools to chip out hardened wax. Glass scratches and you risk shattering the bottom of the jar.
FAQ
How do you get hardened wax out of a candle jar?
Three methods work: pour just-boiled water in and let the wax melt and float to the top (fastest), put the jar in the freezer for 1-2 hours and pop the wax disc out (cleanest), or place the jar upside down in a 180°F oven on a wire rack for 10 minutes (best for thin stubborn layers).
Will boiling water crack a candle jar?
Rarely, with good-quality jars. The risk is highest if the jar starts cold and you pour very hot water in. Let the jar reach room temperature first, and use just-boiled water (around 200°F) rather than water actively boiling.
Can I just throw the candle jar in the dishwasher?
Not until the wax is removed. Wax in a dishwasher melts and recoats other dishes, plus it can clog the dishwasher's drain. Remove the wax first, then the jar can go in the dishwasher (top rack).
What do I do with the leftover wax?
Throw it in the trash. Don't pour it down the drain (clogs pipes) or down the toilet. If you collected a lot of leftover wax across multiple jars and you're crafty, you can re-melt it for tea light pours, but most people just toss it.
How do I get the metal wick base out of the jar?
Pry up with a butter knife. It's just held by a small amount of glue. Once the wax is gone (or even before), the metal disc lifts off cleanly.
Can I reuse the jar for a new candle?
Yes. If you have a wick, wick sustainer, and either bulk soy/coconut wax or a melted candle to pour, you can DIY a refill. There are plenty of guides online. Wick of Hope doesn't sell refill kits, but our jars are standard 8oz glass that work with any wick suitable for that diameter.
How do I clean off the label residue?
Goo Gone, or a paste of equal parts vegetable oil and baking soda. Apply, wait 5 minutes, rub off, rinse with hot soapy water.
Bottom line
Empty candle jars are some of the most reusable household objects you'll ever throw away. Five minutes of work with hot water (or two hours in the freezer) gets you a clean glass vessel for plants, brushes, organizing, or whatever else.
Wick of Hope jars are made from clean unprinted glass with a stable thick base, designed to be kept after the candle's done. The jar is part of the value, not packaging. Hand-poured in London, Ontario, with 100% coconut soy wax and FSC-certified wooden wicks.
