How to Get Rid of a Musty Smell in Your House (NZ Homes)
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- How to Get Rid of a Musty Smell in Your House (NZ Homes)
That stale, damp smell isn’t just unpleasant — it usually means mould or trapped moisture somewhere in your home. Here’s how to actually get rid of it, not just cover it up.
A musty smell almost always comes from mould, mildew, or trapped moisture growing somewhere with poor airflow — think wardrobes, under-sink cupboards, laundries, and carpet underlay. It’s rarely dirt; it’s dampness that hasn’t had a chance to dry out, giving mould spores exactly the environment they need to spread.
In Auckland’s humid climate, and especially in older North Shore weatherboard homes, moisture builds up faster than most people expect. A slow leak under the sink, a window that never quite dries out, or washing left in the machine overnight can all be enough to start it off.
The smell itself comes from microbial volatile organic compounds — gases released as mould and mildew grow. It’s the same reason a damp towel left in a gym bag smells sour within a day: given warmth, moisture, and something organic to feed on, mould-causing microbes multiply quickly.
Find and dry out the damp source first, then clean the affected surface with a concentrated enzyme cleaner to break down mould and odour-causing residue, ventilate the room well, and run a dehumidifier if humidity stays high. Masking the smell with fragrance without fixing the moisture just lets it come back.
Musty smells are easiest to fix once you know exactly where they’re coming from. Start with these spots — they’re the most common sources in NZ homes:
Once the damp source is fixed and the area is cleaned and dried, a musty smell usually clears within a few days to a week. If it lingers longer than that, moisture is likely still trapped somewhere — inside walls, under flooring, or in insulation — and may need a professional damp or mould inspection.
Homes on Auckland’s North Shore, particularly older weatherboard properties near the coast, tend to hold onto damp longer over winter simply because of the humidity. Running extraction and airflow consistently through the cooler months does more to prevent the smell coming back than any amount of after-the-fact cleaning.
It can contribute to symptoms — prolonged exposure to mould spores can trigger sneezing, coughing and irritated eyes, and can worsen asthma. It’s worth treating the smell as a signal to check for damp, not just something to mask.
It helps a lot by drying out the air that mould needs to grow, but it works best alongside cleaning the affected surfaces — on its own it won’t remove mould that’s already there.
Rain increases outdoor humidity and can highlight damp spots that dry air was masking, especially around window frames, roof spaces and subfloors in older Auckland homes.
Usually, yes, but it can also come from damp carpet underlay, an ageing washing machine seal, or trapped moisture in cupboards that hasn’t visibly grown mould yet.
Bleach can lighten the look of mould on the surface, but it doesn’t break down the organic material as effectively as an enzyme-based cleaner, and it doesn’t address the moisture that caused it — so the smell often returns.
Musty smells are your home telling you moisture is trapped somewhere. Fix the damp, clean with an enzyme-based product rather than masking the smell, and keep airflow moving — and it shouldn’t come back.
Stephanie founded Clean for Good to bring a healthier, more thoughtful approach to home cleaning on Auckland’s North Shore, using low-tox, effective methods and a team that treats every home like their own.
@cleanforgoodnz
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