Should You Leave the Washing Machine Door Open After Use?

Why leaving the washing machine door open matters

After a wash cycle finishes, the inside of your machine remains warm and damp. Closing the door traps that moisture with nowhere to go. In a sealed, dark cavity with residual warmth, the conditions are almost ideal for mould and bacteria to establish themselves — particularly on the rubber door gasket, where water tends to pool in the folds.

The consequences are practical and immediate. Mould growth on the door seal produces musty odours that can transfer directly onto freshly laundered clothes. Over time, the spores can also cause the rubber to deteriorate prematurely, which leads to a seal that no longer holds water reliably. What starts as a minor hygiene issue can become a costly repair.

Leaving the door open does one simple thing: it allows air to circulate freely through the drum. That airflow carries moisture away, and without persistent dampness, mould has no foothold.

Front-loader vs top-loader: does it make a difference?

The advice to leave the door open is most critical for front-loading washing machines, and there is a structural reason for this. Front-loaders use a thick rubber gasket around the door opening to create a watertight seal during the wash. That gasket has deep folds and crevices where water collects naturally. Without adequate drying time, this is where black mould growth typically begins.

Top-loading machines are less vulnerable. Because they open from above, any residual moisture tends to evaporate more readily — the drum geometry and the absence of a front-door gasket mean humidity does not concentrate in the same way. That said, leaving the lid ajar on a top-loader after use is still sensible practice. It adds nothing to your workload and removes any small risk of odour build-up in the drum interior.

If you have a washer-dryer combination, check the manufacturer guidance. Some models have specific ventilation requirements after a drying cycle, where residual heat and condensate need to clear before the door is closed.

How long should you leave it open?

A useful rule of thumb is to keep the door open for as long as your laundry takes to dry. If you hang clothes on a rack or put them out, leave the machine door ajar until you bring the washing in. For most households this means several hours, which is sufficient for the drum and seal to dry fully.

If space is a concern — perhaps the machine is in a narrow utility cupboard where an open door creates an obstruction — you do not need the door fully open. Even a few centimetres of clearance is enough to allow meaningful airflow. The goal is to break the sealed environment, not necessarily to open the door as wide as it will go.

If you run a wash late in the evening and need to close the door before bed, try to leave it open for at least two to three hours first. That window captures most of the evaporation. Closing the door after a thorough wipe-down of the seal is far better than closing it on a damp drum immediately after unloading.

Don’t forget the detergent drawer

The detergent drawer sees a constant cycle of moisture, soap residue, and darkness — three conditions that accelerate mould and bacteria growth. Many people focus entirely on the door and drum while ignoring the drawer, only to find a persistent musty smell that a drum clean alone cannot resolve.

Pulling the drawer open after each wash takes seconds and makes a considerable difference over time. If you notice visible mould or a pink-tinged residue in the softener compartment, remove the drawer entirely and clean it under warm running water with an old toothbrush. Most drawers clip out with a simple press-and-pull action — check your machine’s manual if you have not done this before.

A simple post-wash routine

Good washing machine hygiene does not require much time. The following routine, carried out consistently after every cycle, covers the essentials:

When leaving the door open is not enough

If your machine already has a persistent musty smell despite keeping the door open regularly, the mould is likely already established — either on the rubber seal, in the detergent drawer, or inside components you cannot reach by wiping. Opening the door prevents future build-up, but it will not clear an existing problem on its own.

In that case, start with a thorough manual clean of the seal and drawer, then follow it up with one or two consecutive maintenance washes at 60°C using a dedicated washing machine cleaner. Products designed specifically for this purpose contain surfactants and descaling agents that penetrate internal pipework more effectively than vinegar alone.

If the smell persists after several cleaning cycles, mould may have grown behind the drum or in the pump filter — areas you cannot clean without disassembly. At that point, it is worth calling a qualified appliance engineer rather than attempting to take the machine apart yourself, which may also affect your warranty.

Keeping the machine in a well-ventilated room also plays a role. A laundry room or utility area with no natural ventilation will remain humid after a wash cycle, which slows the drying process inside the machine even with the door open. If ventilation is poor, consider a dehumidifier or an extractor fan to reduce background humidity in the room itself.

For further guidance on household moisture management, the UK government’s guidance on understanding and addressing the health risks of damp and mould covers the relationship between poor ventilation, humidity, and mould growth in residential settings.

Frequently asked questions