Patient handout
DIY mould remediation
Properly cleaning up a water-damaged home means more than spraying a mould-killing product on the surface. It involves stopping the moisture, finding every spot the contamination has spread to, killing the live mould, and then physically removing the mould, its toxins and inflammagens, room by room.
The four steps of remediation
Remediation of a water-damaged building follows four steps, in order. Doing them out of order, or skipping the physical removal, is the most common way the job fails.
Eliminate any ongoing sources of moisture
Mould keeps coming back while a leak or damp problem is still active, so this must be fixed first.
Locate all sources where contamination has occurred
Track down every area the mould has spread to, not just the obvious patch.
Kill the live mould and bacteria
Treat the affected areas to kill what is actively growing.
Physically remove the mould, toxins and inflammagens
Use a HEPA vacuum to physically lift the mould and its by-products off surfaces. It is best to have the vacuum sitting outside the dwelling so the exhaust does not recirculate indoors.
Dead mould still releases toxins and inflammagens. Simply spraying mould-killing agents is close to useless and could in fact cause greater exposure. The physical removal in step four is what makes the difference.
Step one: find and fix the moisture
The first step is to identify and correct any moisture issues in your home. Some of these will be obvious. Others may not be: you would not know, for example, if water was logging inside a shower wall. A mould inspector can use meters to test both the humidity in the air across different rooms and the moisture within walls.
Common sources of moisture to check for:
Cooling and ventilation
A leaky wall-mounted air conditioner, condensation in a ducted air conditioner, or poor ventilation in bathrooms.
Roof and pipes
Roof leaks, water pipe leaks, and water logging in a shower wall due to internal leakage.
Appliances
Leaks from a fridge, dishwasher, or washing machine.
Building and weather
Rain intrusion through windows or building design flaws, and moist basements.
Cleaning a room thoroughly
Once any moisture issues have been addressed, and any damaged or affected building materials and contents have been removed, each room is cleaned individually. To thoroughly clean a room, follow these steps.
- Open windows to the outdoors as wide as they will open to allow good ventilation.
- Remove every item from the room. Place items outside if the weather permits.
- For the ceiling, walls, and floor, follow the three-step surface clean below.
The three-step surface clean (ceiling, walls, floor)
| Step | Action | What it does |
|---|---|---|
| 1 | HEPA vacuum | Physically lifts mould, toxins, and inflammagens off the surface. Use a HEPA-filtered vacuum (see the safety note below). |
| 2 | Scrub with dilute vinegar in water | Cleans and helps break down residual mould on the surface. |
| 3 | Scrub with tea tree oil in water | A natural antifungal step to finish the surface. |
Carpets and washable items
If you own your home
Ideally remove the carpets, clean underneath as described above, and then paint the floor with a natural concrete sealer paint.
If you rent
Slowly HEPA vacuum the carpet three times.
Washable items
Put all washable items (clothes, curtains, floor mats, bedding, and so on) through the wash with Napisan. If you have multiple chemical sensitivity, first make sure there is no reaction to the product.
Bed pillows
Throw away your old bed pillow and replace it with a new organic cotton or wool pillow.
Furniture and items that cannot be washed
For every item that cannot go through the washing machine (for example a desk, bed frame, or heater), follow these three steps.
| Step | Action | Detail |
|---|---|---|
| 1 | HEPA vacuum the whole surface | Vacuum every square inch of the surface of the item. |
| 2 | Wipe with diluted white vinegar | Use a solution of 4 parts vinegar to 1 part water. |
| 3 | Wipe with tea tree oil solution | Use a tea tree oil solution, with or without clove oil added. |
Move everything back into the room only after it has been thoroughly cleaned as described here.
What is best thrown away
Some items are best discarded if they have been in a mould-contaminated environment, because they hold mould and its by-products and cannot be fully cleaned.
Best discarded Throw away
Leather items, papers, and any porous items such as wood with obvious mould growth on them.
Books can sometimes be kept Salvage
Books may be kept by HEPA vacuuming the entire surface and then moving them to a sealed container, such as a zip-lock bag.
Protecting your own health
If your health has been affected by mould, it is highly recommended that you do not do the above work yourself. Ideally, have family and friends do it for you, because doing it yourself could damage your health through further exposure to toxins stirred up during the cleaning process. Ideally, leave the house while this work is being done.
A note on HEPA vacuums
HEPA stands for high-efficiency particulate air. Certain vacuums, often those bought by allergy sufferers, are fitted with a HEPA filter. Many others are not. You may be able to borrow one from a friend or relative, or rent one.
References
www.survivingmold.com
Dr Sandeep Gupta
Frequently asked questions
How do you remove mould from a water-damaged home?
Effective mould remediation follows four steps in order: first stop the moisture source, then find all the contamination, then kill the live mould and bacteria, and finally physically remove it, mainly through HEPA vacuuming. A key point is that dead mould still releases toxins, so spraying alone is not enough, the physical removal is the real work. If your health is affected by mould, you should not do this yourself because of the risk of further exposure when toxins are stirred up.
Does spraying mould actually get rid of it?
No. Spraying may kill live mould, but dead mould still releases toxins and inflammatory compounds, so physical removal is what matters. The recommended surface approach is a three-step clean: HEPA vacuum to physically lift the spores, a diluted vinegar scrub at roughly four parts vinegar to one part water, then a tea tree oil finish. Without the physical removal step, spraying alone leaves the problem largely in place.
Is it safe to clean mould yourself?
It depends on your health. If mould has been affecting your health, you should not do the remediation yourself, because disturbing it can stir up toxins and cause further exposure, and ideally you would leave the house while the work is done. For those who do tackle it, opening windows wide, removing items first, and using HEPA vacuuming with proper precautions are important. The first priority is always fixing the moisture source so mould cannot simply return.
Reviewed by Rohan Smith, BHSc Nutritional Medicine · Elemental Health & Nutrition, Adelaide. Last reviewed 13 June 2026.
Important: This summary is general information, not personalised medical advice, diagnosis, or a treatment protocol. Speak with a qualified practitioner about your individual situation. Book a consultation →