TL;DR
Unplug a wine cooler and empty it before cleaning, then wash the shelves outside the cabinet and wipe the interior with a mild unscented solution -- fragrance is the one thing to avoid, because corks are porous and pick up odors. Clear the small drain hole at the back of the interior, since a blocked drain is the most common cause of standing water and a musty smell.
Why fragrance is the wrong choice here
Wine breathes through the cork, which means the cabinet's air is in slow contact with the wine for months or years. Scented cleaners, air fresheners, and heavily perfumed products can leave odor behind that a cork will pick up.
So the rule for a wine cooler is different from a regular fridge: unscented, mild, and thoroughly rinsed. A solution of warm water with a little baking soda, or plain warm water with a small amount of unscented dish soap, is the standard approach.
Avoid bleach entirely. It leaves a smell, it can damage some interior finishes, and it must never be combined with vinegar, ammonia, or alcohol in any container because those mixtures produce toxic gases.
How do you clean a wine cooler?
Unplug it, move the bottles to a cool dark place, and remove the shelves. Wash the shelves separately in warm water with a little unscented dish soap, wipe the interior walls and the glass door with a mild unscented solution, rinse with a clean damp cloth, and dry everything. Clear the drain hole at the back of the floor, then leave the door open for an hour before reloading.
Do the whole job in one pass so the cabinet is not sitting open with bottles inside for hours.
Store the bottles lying down and out of sunlight while you work. Temperature swings are harder on wine than a couple of hours off cooling.
Wooden shelves need different handling
Many wine coolers use wood or wood-faced shelves. Wood is not a wipe-with-anything surface. Never soak wooden shelves, and never put them in a dishwasher -- both cause swelling, splitting, and warping.
Wipe wooden shelves with a barely damp cloth and dry them immediately, then let them air dry completely before they go back in the cabinet. A shelf returned damp is a shelf that grows mildew in a dark cool box.
Metal or wire shelves can be washed normally in warm soapy water. Dry them fully to avoid rust spots on the coating.
The drain hole and standing water
Most compressor-cooled wine coolers have a small drain hole in the back of the interior floor that carries condensate to an evaporation tray behind the unit. Dust, label fragments, and cork debris block it.
Find it, and clear it with a cotton swab or a soft pipe cleaner. Do not push a stiff wire through -- you can damage the drain line.
A blocked drain is the leading cause of water pooling on the cabinet floor, which is in turn the leading cause of a musty smell. Clearing it usually fixes both. The same drain check applies to a mini fridge and how to keep it from smelling musty.
The door seal and the glass
The gasket around the door is a folded rubber or silicone strip that traps dust, spills, and mildew in its creases. Wipe it with a cloth wrung out in warm soapy water, working into the folds, then dry it.
A dirty or hardened gasket lets warm humid air leak in, which makes the compressor run more and raises humidity inside. That shows up as condensation on the glass and a labouring unit.
Test the seal by closing the door on a sheet of paper. If the paper pulls out with no resistance, the gasket needs cleaning or replacing.
Clean the glass door with a mild unscented glass solution applied to a cloth, not sprayed at the unit, and keep ammonia-based cleaners away from any coated display or control panel -- ammonia and alcohol damage coated screens.
Source: U.S. Department of Energy guidance on refrigeration appliance maintenance
The condenser coils and the vents
Coils on the back or underneath collect dust, and a dusty coil makes the unit run hotter and longer. Unplug the cooler, pull it out if it is freestanding, and vacuum the coils with a brush attachment.
Check the ventilation clearance. Built-in units vent from the front grille, and a blocked grille is a common cause of poor cooling that gets mistaken for a failing compressor.
Do this twice a year. It is the maintenance step with the biggest effect on running cost and lifespan, and it is exactly the same job on a chest freezer without a full defrost day.
Getting a musty smell out
Start with the causes: standing water from a blocked drain, a wet wooden shelf, a dirty gasket, or a spill that ran under the floor liner. Fix the cause first, because deodorizing over a wet shelf accomplishes nothing.
After the cabinet is clean and dry, an open box of baking soda or a shallow dish of activated charcoal absorbs residual odor over a few days. Leave the door open for an hour or two first if you can.
Do not use scented deodorizers, cedar blocks, or essential oils in a wine cabinet. They solve the smell you notice and create one the cork will absorb.
Reloading and routine
Put the shelves back only when they are bone dry. Reload bottles on their sides so corks stay moist, and leave the unit to return to temperature before you judge whether anything is wrong.
Wipe spills the day they happen. Vacuum the coils twice a year. Do a full interior clean once or twice a year, or whenever a bottle leaks.
Cleaning keeps the cabinet dry, the seal tight, and the air neutral. It does not improve the wine or fix a cooling fault. If the cooler sits in a kitchen or dining room that needs a broader reset, house cleaning services can take the room. Chilled appliances share these rules across the board, and the general principles live in the small appliance cleaning guide.
FAQ
What should you use to clean the inside of a wine cooler?
Use warm water with a little unscented dish soap, or a mild baking soda solution, applied with a cloth and followed by a clean damp cloth. Avoid bleach, scented cleaners, and anything perfumed, because corks are porous and can absorb odors from the cabinet air over time.
Why does my wine cooler smell musty?
A blocked drain hole causing standing water is the most common cause, followed by damp wooden shelves and a dirty door gasket. Clear the drain with a cotton swab, wash and fully dry the shelves, clean the gasket folds, and let the cabinet air out before reloading bottles.
Can wine cooler shelves go in the dishwasher?
Wooden and wood-faced shelves must never go in a dishwasher or be soaked, because they swell, split, and warp. Wipe those with a barely damp cloth and dry them immediately. Metal or wire shelves can usually be washed by hand in warm soapy water, then dried fully to prevent rust.
How do you clear a wine cooler drain hole?
Find the small hole in the back of the interior floor and clear it gently with a cotton swab or a soft pipe cleaner. Do not force a stiff wire through, since that can damage the drain line. Check it during every interior cleaning, because cork debris and dust block it easily.
How often should you clean a wine cooler?
Do a full interior clean once or twice a year, or immediately after any bottle leaks. Wipe the door gasket and check the drain during each of those cleanings, and vacuum the condenser coils twice a year. Wipe visible spills the same day rather than waiting.
Can you use vinegar in a wine fridge?
Diluted vinegar can clean the interior, but its smell lingers, which is a problem in a cabinet where corks absorb odors. Unscented dish soap or a baking soda solution is the better choice. Never mix vinegar with bleach or any chlorine product, because that reaction releases chlorine gas.
A wine cooler is usually in a room that hosts people, which means the cabinet is rarely the only thing that could use attention. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.