How to clean a wax warmer

This decides everything, and it is the reason generic cleaning advice fails half of the people reading it.

The one the makers themselves publish, and the right default for any hard dish. The listing for the Colonial Candle warmer we index describes both versions of it: the "cotton ball method" - absorb the melted wax, let it cool, wipe clean - and the "soft wax method", which is to reheat for two to three minutes and then lift the softened wax out in one piece.

1. Switch on for two or three minutes. You want soft, not a full liquid pool. Softened wax lifts; liquid wax smears.
2. Switch off and unplug. Everything after this happens on a cold appliance.
3. Lift the puck out with the corner of a paper towel, or press a cotton ball into the liquid and let it soak the wax up. Two or three cotton balls will clear a small dish.
4. Wipe the film with a dry paper towel while the dish is still just warm. This is the step people skip, and the film is what makes the next scent smell like the last one.

Used cotton balls and wax pucks go in the trash, never down a drain.

Silicone only, and it is the fastest method by a distance because there is no heating step and no wiping.

Let the wax go completely cold and hard - an hour is usually plenty - then flex the dish or liner. Wax does not bond to silicone, so the puck releases in one piece and the dish underneath is clean. Every liner sold in this category is selling that one behavior, and it is the reason a silicone-dish warmer is easier to live with than a prettier ceramic one.

Two details worth knowing. A cold puck can go straight back in later, so you can switch scent without throwing away wax that still has fragrance in it. And if the puck will not release, the wax is not cold enough yet - warming it will not help.

Only for a dish that comes out, and it is the one to use when the wax has gone hard and stubborn in a ceramic dish.

Let the dish reach room temperature first, then put it in the freezer for fifteen or twenty minutes. Wax contracts as it cools faster than ceramic or glass does, so it cracks and lifts away with a gentle push from your thumb.

The caution is thermal shock in both directions: never put a warm dish straight into a freezer, and do not run hot water over a dish that has just come out. Both are ways to crack a dish that was fine.

• Metal scrapers, knives and forks. They scratch the glaze, and wax keys into a scratched surface far harder than into a smooth one. One session with a butter knife makes every future clean worse.
• Water into a hot dish. Cracks ceramic and glass, and puts water where the electrics are.
• Washing the warmer body. The dish may be washable; the appliance is not. If the dish does not lift out, nothing goes near a sink.
• Pouring melted wax down a drain. It sets in the trap. This is the one that turns a five-minute job into a plumber.

Solvents are not on that list because they are rarely needed. A film that survives a dry wipe will come off with a paper towel and a little rubbing alcohol on a cold, unplugged, removed dish - but do that outside the warmer, and never on a warm plate.

Change the wax when the fragrance goes, not when the dish looks dirty. Those are two different moments and the second one arrives much later.

Warmed wax does not burn off - Candle Warmers Etc. states plainly that "warming a candle will not cause the wax to burn off" - so a dish can be visually full and completely spent. Happy Wax publishes a rule of thumb of two cubes for about eight hours of scent time, which is a useful anchor even if your wax differs.

The full diagnosis is on why you cannot smell your wax melts, and how long a melt lasts has the timings. Cleaning a dish that still has working wax in it is throwing money away.

Buy liners. A silicone liner sits in the dish, takes the wax, and turns the whole job into lifting one piece of silicone out and dropping the puck in the trash.

The one measurement that decides whether they work is the bottom diameter of your dish, not the top. A liner that is slightly too big sits proud of the base, traps air underneath it and heats unevenly; too small and wax runs down the side into the dish you were protecting. Liners and replacement dishes covers sizing, materials and what to do when the dish itself is broken.

Two habits help as much as any product: do not overfill the dish, because wax that creeps over the rim is the mess that never comes off cleanly, and keep one liner per scent family if you are fussy about fragrances mixing.