If you suspect mould at home, the goal is not to panic. The goal is to get practical.
Mould is usually a moisture problem first. If you do not address the moisture, mould tends to come back, no matter how good your cleaning routine is.
This guide covers how to find it, what you can safely clean yourself, what you should not DIY, and what to do if you are already feeling unwell.
TL;DR (read this first)
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Look for moisture first. Leaks, condensation, humidity, poor ventilation.
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Musty smell counts, even if you cannot see mould.
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Small areas on hard surfaces can often be cleaned safely with good ventilation and protective gear.
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Avoid dry brushing or vacuuming mould dry. It can spread spores.
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Porous items that stayed wet for more than about 48 hours often need drying fast or disposal if mouldy.
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If you are very sensitive, have asthma, or are immunocompromised, do not do the cleanup yourself.
A quick safety note before you start
Cleaning mould can irritate eyes, skin, and lungs. Some people should not be involved in cleanup, especially people with asthma or chronic lung disease, immune suppression, or significant mould allergy.
If you are in that category, get someone else to handle cleanup, or use a qualified professional.
Step 1: Find the moisture source (this is the real “treatment”)
Mould needs moisture. So your first job is to work out why an area is staying damp.
Common sources:
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Roof leaks, plumbing leaks, dripping air conditioners
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Bathroom steam with poor ventilation
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Condensation on windows and cold walls
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Rising damp or subfloor moisture
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Flooding, storms, wet carpets, wet insulation
If you only wipe the mould but the dampness continues, it usually returns.
Step 2: Know the common mould hiding spots
Mould is often not in the middle of the wall. It tends to be in corners and quiet zones where air does not move.
Check:
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Window frames, sills, and curtains
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Bathrooms, ceilings, grout, behind toilets
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Under sinks and behind dishwashers
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Behind wardrobes, especially on external walls
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Bedrooms with closed windows and lots of soft furnishings
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Laundries and around washing machines
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Under rugs, behind couches, inside cars that have moisture issues
If it smells musty, treat that as a clue even if you cannot see anything.
Step 3: Decide if this is a DIY job or a professional job
A simple rule is: small and on hard surfaces is more DIY-friendly. Bigger, hidden, or structural is not.
DIY is more reasonable when:
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The patch is small and on a hard surface (tiles, glass, sealed surfaces)
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You can ventilate well
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You can protect yourself with proper gear
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There is no ongoing leak
Consider professional help when:
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The affected area is large or keeps returning
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Mould is in roof cavities, under floors, inside walls, or in insulation
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There has been flooding or significant water damage
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You have major health sensitivity and cannot tolerate exposure
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You need to remove building materials like plasterboard
Step 4: What to wear (yes, it matters)
Protect yourself and keep spores from spreading.
At minimum for cleaning:
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Gloves (nitrile or rubber)
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Eye protection
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A P2 mask (Australia) or N95 equivalent
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Clothing that covers skin, then wash after
This aligns with Australian health guidance and occupational safety advice.
Step 5: Do not dry brush mould
Avoid dry brushing or wiping mould dry. It can release spores into the air and spread the problem.
Use a damp method and dispose of cloths appropriately.
Step 6: How to clean small areas safely (hard surfaces)
For routine cleanup, NSW Health suggests mild detergent or a vinegar-and-water solution, and only using bleach in specific situations when items cannot be discarded and mould is not readily removed.
Vinegar solution (for routine cleaning)
NSW Health lists a diluted vinegar approach as an option for routine clean-up of mouldy surfaces.
Step 7: Porous materials (soft items) are a different game
Carpet, plasterboard, insulation, mattresses, soft furniture, and some timbers can be hard to clean properly once mouldy.
WorkSafe Queensland notes that if porous materials have been wet for less than about 48 hours, you may be able to dry them quickly, but if wet longer and mould develops they can be difficult to clean properly.
CDC guidance also emphasises that cleanup depends on the extent of water damage and can involve removing and replacing materials in bigger jobs.
If in doubt, especially after flooding, seek professional advice.
Step 8: Drying and prevention (how to stop it coming back)
Cleaning removes what you can see. Prevention is what keeps you from doing this again next month.
Practical prevention:
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Keep indoor humidity lower (dehumidifier can help)
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Use exhaust fans in bathrooms and kitchens
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Increase airflow in wardrobes and bedrooms
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Fix leaks properly, not “later”
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Dry wet areas fast after storms or spills
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Avoid drying clothes indoors without ventilation
NSW Government tenant guidance also emphasises early cleaning and drying thoroughly, since mould is much harder to remove once it takes hold.
If you are feeling unwell, do this next
If mould is part of your health picture, the best health plan starts with the same principle.
Stop the leak before you mop the floor.
That means reducing exposure as best you can, then stabilising foundations like sleep, digestion, stress response, and steady routines. If you are sensitive, avoid doing ten new supplements at once. Go one step at a time.
Mould Exposure: Why You Feel Worse and What to Do First
Book an appointment
If you want a guided plan using acupuncture and Chinese herbal medicine, you can book an appointment here.
FAQ
How do I know if mould is “bad enough” to worry about?
If it keeps returning, smells musty, is widespread, or you suspect it is hidden inside walls or ceilings, it is worth getting professional assessment. If you are very sensitive or have asthma, do not DIY cleanup.
Is vinegar better than bleach?
NSW Health lists vinegar diluted in water as an option for routine cleanup, and bleach as an option in specific situations. Bleach has important safety considerations and may not be effective on porous surfaces.
Should I vacuum mould?
Avoid dry methods like dry brushing, and be cautious with vacuuming mould because it can spread spores if not handled correctly. Damp cleanup methods are generally recommended in public health guidance.
What if my landlord will not fix the leak?
Document the issue (photos, dates, communications). The underlying moisture issue needs proper repair or mould often returns. NSW Government housing guidance emphasises reporting damp and addressing maintenance issues.