Why Does Your Washing Machine Smell?
If you’ve noticed a damp, musty, or even sour aroma emanating from your washing machine, you’re not alone. This issue is remarkably common and often stems from the very nature of how these appliances work. Leftover detergent residue, fabric softener, dirt, and lint can build up over time, creating a perfect breeding ground for bacteria and mould. These micro-organisms thrive in the warm, moist environment inside the drum, seals, and hoses, producing the unpleasant odours you detect.
The culprit is often a combination of factors. Modern washing machines, particularly front-loaders, are designed to be highly efficient, using less water per cycle. While this saves resources, it can mean that detergent and dirt don't get rinsed away as thoroughly, leading to a greater chance of residue accumulation. If you also frequently wash clothes at lower temperatures, these cooler cycles may not be hot enough to kill the bacteria and mould effectively, exacerbating the problem.
This persistent smell doesn't just affect your laundry room; it can transfer to your clothes, rendering them less than fresh even after a wash. Understanding the root causes is the first step towards a long-term solution.
- Accumulation of detergent and fabric softener residue.
- Moisture trapped in the drum, door seals, and detergent drawers.
- Bacteria and mould growth in warm, damp conditions.
- Infrequent cleaning cycles or washing at low temperatures.
- Blockages in the filter or drain hose.
Addressing these causes proactively can help prevent the issue from recurring and keep your appliance functioning optimally.
Deep Cleaning to Eliminate Smell From Washing Machine
The most effective way to eliminate smell from a washing machine is through a thorough deep clean. This involves tackling the key areas where grime and micro-organisms tend to hide. You’ll typically need a few common household cleaning agents and some elbow grease.
Begin by cleaning the rubber door seal, especially on front-loading machines. This flexible component can trap water, lint, and mould. Gently pull back the seal and use a damp cloth with a mild detergent or a diluted bleach solution (ensure your machine manufacturer approves bleach use – check your manual) to wipe away any visible grime or black spots. Pay close attention to the folds. For stubborn mould, a soft brush might be useful, but be careful not to damage the rubber.
Next, address the detergent and fabric softener dispenser drawer. These can become clogged with residue. Remove the drawer if possible (consult your manual for instructions) and soak it in warm, soapy water. Scrub any stubborn build-up with an old toothbrush or small brush, then rinse thoroughly and allow it to dry completely before reinserting it. If the drawer cannot be removed, clean it in situ using a cloth and brush.
The door seal and dispenser drawer are prime spots for mould and odour development.
After cleaning these components, it’s time to tackle the drum itself. Many washing machines have a specific drum cleaning cycle. If yours does, run it using a specialised washing machine cleaner, or alternatively, with a cup of white vinegar or baking soda added directly to the drum. If you don't have a dedicated cycle, use the hottest wash setting available (usually 90°C or 60°C) and add your chosen cleaner to the drum.
Using White Vinegar or Baking Soda
White vinegar is excellent at cutting through soap scum and has natural disinfectant properties. Add about 250ml (one cup) of white vinegar directly into the empty drum or the detergent compartment. Run a hot wash cycle (at least 60°C). The acidity of the vinegar helps to break down residue and neutralise odours.
Baking soda is another effective deodoriser and gentle abrasive. You can add about 125g (half a cup) of baking soda directly into the drum and run a hot cycle. Alternatively, you can create a paste of baking soda and water to scrub the inside of the drum manually, paying attention to any visible stains or residue. Some people use both vinegar and baking soda; for example, using vinegar for one hot cycle and baking soda for another, or using vinegar in the drawer and baking soda in the drum for the same cycle (though never mix them directly in the drawer, as they can react). Always follow up with a rinse cycle if necessary.
Specialised Washing Machine Cleaners
These products are specifically formulated to break down detergent build-up, limescale, and kill bacteria and mould. They are often available in tablet, powder, or liquid form and are generally very effective. Follow the manufacturer’s instructions on the product packaging precisely, as methods can vary. They are typically added directly to the drum or the dispenser drawer and the machine is run on a hot cycle.
Cleaning the Filter and Drain Hose
A clogged filter or drain hose is a frequent cause of lingering smells, as it traps stagnant water, lint, and debris. Many washing machines have a small access panel, usually located at the bottom front of the appliance, which houses the pump filter. This is where you need to check.
Before you start, place old towels or a shallow tray underneath the filter housing, as water will inevitably spill out. Slowly unscrew the filter cap. If there's significant water trapped, it might come out with some force, so be prepared. Once the filter is removed, clean it thoroughly under a running tap, removing any lint, coins, hair, or other foreign objects. A small brush can help dislodge stubborn grime.
Inspect the filter housing for any blockages and clear them. Once clean, screw the filter back in securely to prevent leaks. It’s a good idea to run a short, hot rinse cycle afterwards to ensure everything is flowing correctly and to flush out any residual gunk.
A blocked filter prevents proper drainage, leading to stagnant water and smells.
While you have the filter compartment open, it’s also worth checking the immediate area around the pump for any obstructions. The drain hose itself can also become kinked or blocked, preventing water from exiting the machine effectively. Check that the hose is not crushed or twisted, and if accessible, disconnect it (following your manual’s guidance) to check for internal blockages. Flushing it with water or using a flexible plumber’s snake can help clear obstructions.
This maintenance task is often overlooked but is critical for both odour prevention and the overall performance of your washing machine, ensuring it drains water efficiently after each cycle.
Preventative Maintenance: Keeping Smells at Bay
Once you’ve successfully eliminated existing smells, the key is to implement a routine that prevents them from returning. Regular, simple maintenance is far less effort than a deep clean and ensures your washing machine remains fresh and hygienic.
After each wash, leave the washing machine door slightly ajar. This allows air to circulate within the drum, drying out any residual moisture and preventing mould growth. For front-loaders, also leave the detergent drawer slightly open for the same reason. Ensure there are no stray socks or items left behind in the drum.
Wipe down the door seal regularly, especially after washing dark or lint-producing items. A quick wipe with a dry cloth can remove moisture and prevent build-up. If you notice any dampness or residue, a more thorough wipe with a damp cloth can be done weekly.
Run a hot wash cycle regularly. Aim to run a load at 60°C or higher at least once a week, or even bi-weekly, depending on your usage. This higher temperature helps to kill bacteria and dissolve detergent residue that cooler washes might leave behind. If you often wash at lower temperatures for delicates or energy saving, this hot cycle becomes even more crucial.
Use the correct amount of detergent. Overusing detergent, especially liquid varieties, can lead to excessive suds that don't fully rinse away, contributing to build-up. Follow the detergent manufacturer’s recommendations for your load size and water hardness. Consider using a high-efficiency (HE) detergent if your machine is designed for it.
After a wash cycle finishes, immediately remove your laundry. Leaving damp clothes sitting in the machine is a sure-fire way to encourage mildew and transfer that unpleasant odour to your clean laundry.
Regular cleaning of the rubber seal prevents mould and keeps the machine smelling fresh.
Consider a monthly drum clean using a specialised cleaner or white vinegar. This quick cycle can remove any minor build-up before it becomes a significant problem. Finally, don't forget to check and clean the filter at least every few months, or more often if you have pets or wash heavily soiled items.
Troubleshooting Specific Odours
Different smells can indicate slightly different issues within your washing machine. Identifying the type of odour can help pinpoint the exact cause and guide your cleaning efforts.
Musty or Damp Smell: This is the most common type of odour and usually points to mould or mildew growth. It’s often caused by moisture trapped in the door seal, detergent drawer, or drum. The preventative measures of leaving the door open and wiping down seals are particularly effective here.
Sour or Fermented Smell: This suggests bacteria have been allowed to multiply unchecked. It’s often linked to residue build-up from detergent and fabric softener, especially if you frequently wash at low temperatures or use excessive amounts of product. A hot wash cycle with vinegar or a specialist cleaner is the best remedy. Ensure all residue is rinsed away.
Chemical or Plastic Smell: A new washing machine can sometimes emit a plastic or chemical smell during its first few uses. This usually dissipates on its own. If an older machine develops this smell, it could indicate an overheating motor or a component that is starting to fail. In this case, it's advisable to stop using the machine and consult the manufacturer or a qualified repair technician.
Rotten Egg Smell: This typically indicates a build-up of hydrogen sulphide gas, which is often caused by a combination of hard water deposits and bacteria. This can occur in the drum, but also within the drain system or pipes. Cleaning the drum and filter is essential. If the smell persists, it may point to issues with your plumbing or the machine’s drainage system.
When tackling any persistent odour, remember to check that you are using the correct type and amount of detergent for your machine and water conditions. Using non-HE detergents in an HE machine, for instance, can cause excessive suds that lead to build-up and subsequent smells.
When to Call a Professional
While most washing machine smells can be resolved with the cleaning methods outlined above, there are times when professional intervention is necessary. If you’ve diligently followed all the cleaning steps, including the filter and seal, and the odour persists, it’s time to consider external help.
Persistent smells that don't respond to cleaning might indicate a more serious underlying issue that you cannot address yourself. This could include internal blockages deep within the drainage system, problems with the heating element that isn't reaching the correct temperature for effective sanitisation, or a faulty pump that isn't draining water properly. In rare cases, a persistent chemical or burning smell could signal an electrical fault or a failing motor, which poses a safety risk.
Don't ignore persistent smells; they can mask serious mechanical issues.
If your machine is still under warranty, contacting the manufacturer or an authorised service centre is usually the first step. They can advise on whether the issue is covered and arrange for a technician to inspect and repair the appliance. If the machine is out of warranty, you'll need to find a reputable appliance repair specialist in your area. Look for technicians who have experience with your specific brand and model of washing machine.
When you contact a professional, be prepared to describe the smell, how long it has been present, and the cleaning steps you have already taken. This information will help them diagnose the problem more accurately and efficiently. While DIY cleaning is often sufficient, knowing when to seek expert advice can save you time, prevent further damage, and ensure your appliance is safe and functioning correctly.