If your washing machine smells a bit swampy, the problem usually is not the drum alone. It is the mix of leftover detergent, body oils, lint and trapped moisture sitting in the places you do not see every day.

The good news is that you do not need a dramatic reset. A simple clean, the right wash habits and a bit more airflow can usually get things back on track. For households trying to keep things practical with a low-tox home routine, this is one of the easier wins in the laundry.

Why washing machines start to smell in the first place

That musty smell is usually buildup plus moisture. Modern machines, especially front loaders, are designed to use less water. That is great for efficiency, but it also means detergent, fabric softener and grime can hang around if the machine is overdosed or never gets a warmer maintenance wash.

Cold washing adds to it. Plenty of Australian households wash almost everything in cold water, which makes sense for energy use and everyday clothes. But in humid places, or laundries with poor ventilation, cold cycles do not always shift oily residue as well as people expect.

Coastal humidity, wet footy gear, beach towels, pet blankets and school uniforms all bring their own brand of laundry grime. If the machine door gets shut straight after the cycle, that damp air stays trapped inside. Give it a week or two and the smell starts to build.

The main trouble spots are usually pretty predictable:

• the rubber door seal on front loaders
• the detergent drawer
• the drum itself
• the drain filter, if your machine has one

If you have ever pulled back the rubber seal and found grey sludge, hair pins, sand or soggy lint, you are not alone. Top loaders can get grubby too, especially under the rim or around agitator parts, but front loaders tend to hold onto moisture for longer.

A simple natural routine to clean your washing machine

Before you start, check your machine manual if you still have it. Some brands have specific instructions for maintenance cycles, filter cleaning and which ingredients to avoid. If you are renting, it is also worth being careful not to force open any panels or filters you are unsure about.

1. Clean the seal and drawer first

Start with the areas that collect visible gunk. Remove the detergent drawer if it is designed to come out, then wash it in warm water and wipe into the housing with a cloth. A soft brush can help with corners.

On a front loader, pull back the rubber seal gently and wipe away residue with a damp cloth. If there is stubborn buildup, a little bicarbonate of soda on the cloth can help lift it. Dry the area well afterwards.

If you use an essential-oil based cleaner elsewhere in the home, keep in mind that fragrance is not the fix here. This job is mostly about removing residue and letting the machine dry properly. For readers interested in gentler scent choices around the house, fragrance-free versus natural scent is a useful distinction.

2. Run an empty maintenance wash

Once the visible grime is gone, run an empty hot or warm cycle. For many machines, this is the step that helps freshen the drum and loosen residue inside the system.

You can use bicarbonate of soda in one cycle, then a separate citric acid or vinegar-based clean later if appropriate for your machine. Do not combine them in the same wash and do not mix them with bleach or other cleaning products.

A simple approach is:

Run one empty hot wash with bicarbonate of soda. If the machine still smells or has mineral buildup, follow with a separate empty wash using citric acid or white vinegar, only if your manufacturer allows it. Some machine brands prefer citric acid over vinegar for maintenance, so check the label and manual first.

If you have hard water, you may find scale builds up faster. If your laundry also battles damp smells through winter or wet weather, the same moisture habits that affect bathrooms can show up here too. Our guide to natural ways to freshen up your home covers a few practical airflow habits that help.

3. Wipe the exterior and check the filter

Finish by wiping the control panel, door, lid and exterior with a soft cloth. Do not spray directly onto electronic panels. Spray onto the cloth first if needed, and keep moisture light around buttons and displays.

Then check the drain filter if your machine has one and the manual explains how to access it safely. Have an old towel or shallow tray ready because a bit of water often comes out. Remove lint, coins, pet hair or sandy sludge, then refit everything properly.

If your machine still smells after one clean, repeat the process the following week. A machine that has been heavily overdosed with detergent for months may need a couple of rounds before it improves.

How to stop the smell coming back

Once the machine is clean, the real trick is not undoing the work. Most washing machine smells come back because the routine stays the same.

Use the correct amount of detergent for the load size and soil level, not just the full cap by default. More detergent does not always mean cleaner clothes. It often means more residue left behind.

Leave the door and detergent drawer ajar after each wash so the inside can dry out. In a small laundry, apartment cupboard or internal European-style laundry, even a little airflow makes a difference.

Try to schedule a hot maintenance wash once a month, or at least seasonally. Before peak summer humidity is a smart time in many parts of Australia. So is after winter, when condensation and closed-up laundries can leave everything a bit stale.

If you are simplifying your cleaning cupboard more broadly, it helps to think in routines rather than products. A cloth that dries well, a sensible detergent dose and one monthly reminder often do more than buying another speciality cleaner. We share more of that approach over on the Noosa Nude blog.

A clean washing machine does not need much fuss. Wipe the seal, air it out, go easy on detergent and give it a proper empty wash now and then. That is usually enough to keep the musty smell from settling back in and to help your laundry come out smelling like washing, not like the machine.