Mould prevention checklist for Australian homes
Published by Aurala Naturals. Last updated 2026.
A mould prevention checklist keeps the two things mould needs, moisture and still air, from ever building up. Squeegee wet surfaces and run the fan daily, wipe high-risk spots weekly, adjust for the season, and fix leaks and poor ventilation at the source. Keep indoor humidity under about 60 per cent.
What is the daily mould prevention checklist?
Daily habits stop moisture from settling long enough to feed mould. Mould spores are always in the air, and they only take hold when a surface stays damp, so the daily list is short and fast:
- Squeegee the shower walls and screen after every wash. A ten second wipe removes most of the water that would otherwise sit and evaporate into the room.
- Run the exhaust fan during the shower and for at least twenty minutes after, so the warm wet air leaves rather than condensing on the ceiling.
- Open a window or two for cross ventilation, especially in the kitchen and bathroom, to move humid air outside.
- Wipe condensation off windows, sills and cold walls as soon as you see beads forming.
None of this takes more than a couple of minutes, and it targets the exact places where damp lingers. If you understand how mould actually gets started on a surface, the logic of the daily list is obvious: deny it standing water and it has nothing to grow on.
What should be on the weekly checklist?
The weekly tasks catch the slow build up in spots you do not touch every day. These are the corners, seals and hidden bases where a thin film of damp and dust collects and turns into the first grey speckle:
- Wipe the high-risk spots: shower grout and silicone, window sills, the base and back wall of the wardrobe, and behind furniture pushed against external walls.
- Empty and rinse the dehumidifier reservoir, and check that it is still pulling water from the air.
- Clean the exhaust fan cover. A dust-clogged fan moves a fraction of the air it should, which quietly defeats your daily ventilation.
- Give the worst spots a light natural-treatment wipe so any spores that landed during the week do not get a head start.
Weekly is also the right rhythm for a quick look in the places you rarely open: under the sink, the laundry cupboard, and the back of the pantry. Early speckling wipes off in seconds. Left for a month it spreads into the grout and paint and becomes a real job.
How does the checklist change with the seasons?
Australia runs two very different mould seasons depending on where you live, so the checklist shifts through the year rather than staying fixed.
In the southern states the danger is winter condensation. Warm indoor air hits cold glass and cold external walls, water beads up, and it soaks into sills, plaster and curtains. Through the cooler months, add a daily wipe of the coldest surfaces and keep bedrooms ventilated even when it is tempting to seal everything shut. Our guide to winter condensation and mould on walls covers the fixes in detail.
In the northern wet season the problem is raw humidity, not condensation. The air itself carries enough moisture to keep every surface damp, so the seasonal focus is humidity control: run dehumidifiers or air conditioning, keep cupboards and wardrobes cracked open so air moves through them, and do not let laundry dry indoors. Whichever half of the country you are in, watch the forecast and lift your routine before a long humid or wet stretch, not after the mould appears.
How do you fix the source of the moisture?
Cleaning and ventilation manage the symptoms, but mould that keeps coming back in the same spot is telling you about a moisture source you have not fixed. This part of the checklist is less frequent but far more important, because it removes the reason the mould is there at all:
- Trace and repair leaks: dripping taps, a slow leak under the sink, a failed shower seal, or roof and gutter water finding its way into a wall.
- Look for rising damp on the lower part of ground floor walls, which points to a failed or bridged damp course.
- Re-seal failed silicone and grout around baths, showers and basins, where water is wicking into the wall cavity behind.
- Improve ventilation in any room that stays stuffy: a better exhaust fan, a wall vent, or simply a door left open.
A surface you dry every day will stay clear. A wall being fed water from behind a failed seal will not, no matter how often you wipe it. When mould is stubborn, work back to the water. The full guide to stopping mould in Australian homes walks through diagnosing each of these sources step by step.
Why does keeping humidity under 60 per cent matter?
Relative humidity is the single number that predicts whether mould can grow, which is why it sits at the centre of any prevention checklist. Below about 60 per cent, most surfaces stay dry enough that spores cannot establish. Push past that, and the moisture in the air alone is enough to feed growth even on surfaces that never get splashed.
A cheap hygrometer, the little humidity meter you can sit on a shelf, turns prevention from guesswork into something you can actually read. Check it in the rooms that give you trouble, usually the bathroom, the main bedroom and any room on the cold or shaded side of the house. If it reads above 60 per cent, that is your cue to run the fan longer, open up, switch on a dehumidifier, or hunt down the moisture source. Aim to keep the number in the 40 to 55 per cent band and most of the rest of the checklist gets easier.
What tools make the checklist easier?
You do not need much to run a prevention routine, and a few cheap items make every task quicker and more reliable:
- A squeegee kept in the shower, so the daily wipe is a reflex rather than a chore.
- A hygrometer in each problem room, so humidity is a number you read rather than a feeling you guess at.
- A small dehumidifier for the room that stays damp, especially through a wet season or a cold, closed-up winter.
- Microfibre cloths for wiping condensation and treating high-risk spots, because they lift water rather than smearing it around.
Set the routine up so the right tool is already where you need it. A squeegee hanging in the shower gets used. One in the cupboard does not. The same goes for the fan you actually switch on and the window that opens easily. Small friction is what makes a checklist slide, so remove it once and the habits look after themselves.
How does a natural treatment fit into the routine?
A treatment wipe is the maintenance layer that sits on top of drying and ventilation. It is not a substitute for either, and no product keeps mould away on its own while the moisture is still there, but a regular light wipe of high-risk spots slows spores from settling between cleans. The honest way to use one is as the fourth habit in the list, after squeegeeing, ventilating and fixing the source.
We make First Light, a six-oil natural mould-defence blend for exactly this job: a weekly wipe on grout, sills and wardrobe bases as part of the routine above. It is made in Australia from clove, litsea, tea tree, eucalyptus and peppermint oils, and it was lab tested at a 99.2 per cent reduction in black mould on direct contact by an independent lab. Dilute as directed, spot-test a surface first, and keep it away from pets and children. Treat it as one line on the checklist, not the whole plan.
Print the list, stick it inside a cupboard door, and work through it a little at a time. Dry surfaces, moving air and a fixed moisture source do the heavy lifting, and a steady routine keeps mould from ever getting a foothold.
Common questions
How often should I do a mould prevention checklist? Split it by rhythm. Daily tasks like squeegeeing the shower and running the fan take a couple of minutes. Weekly, wipe the high-risk spots and empty the dehumidifier. Seasonal checks shift with winter condensation in the south and wet-season humidity in the north. Fixing leaks and seals happens whenever you spot them.
What humidity level prevents mould? Keep indoor relative humidity under about 60 per cent, and ideally in the 40 to 55 per cent band. Below that range, most surfaces stay dry enough that mould spores cannot take hold. A cheap hygrometer lets you read the number in each room, so you know when to run the fan, open up or switch on a dehumidifier.
Why does mould keep coming back after I clean it? Cleaning removes what you can see, but if a surface keeps growing mould in the same spot, water is still reaching it. Common sources are a failed shower seal, a slow leak, rising damp or poor ventilation. Trace the moisture back to its source and fix that, otherwise the mould returns no matter how often you wipe.
Can a natural treatment replace the rest of the checklist? No. A natural treatment wipe is one line on the list, not the whole plan. Drying surfaces, moving air and fixing the moisture source do the real work. A regular wipe of grout, sills and wardrobe bases slows spores from settling between cleans, but it cannot keep mould away on its own while the damp is still there.
