Building Biology | Why I dont recommend clove oil to clean mould
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Why I dont recommend clove oil to clean mould

Why I dont recommend clove oil to clean mould

The use of clove oil to kill mould is something few households question. Like so many Wives Tales however, there is little basis for this assumption. Clove oil like many essential oils (rosemary, cinnamon, tea tree and oregano), have antifungal properties which are used as a defence mechanism by the plant to prevent fungal attack. In a water damaged building however, dumping wads of clove oil will not address the cause of the mould problem or its adverse health effects. Why I hear you ask? Because over 70% of mould spores are dead anyway ie they cannot germinate. Depending upon the type (genre) of fungi and their numbers, these ‘dead’ spores and hyphae fragments may contain mycotoxins which are responsible for the adverse health effects typically found in water damaged buildings.  So you see it is irrelevant as to whether you kill the mould (spores) or not, as the focus should be on the cause of mould growth which is moisture. The IICRC S520 standards which is considered to be the international text for mould remediation, recommends that biocides (chemicals which kill fungi) should be avoided in water damaged buildings because they are ineffective and in addition, may expose the user to potentially toxic vapours. Clove oil is no exception as it contains Eugenol – a constituent that is toxic to the skin, eyes and liver, as well as to the central nervous system leading to dizziness, convulsions, unconsciousness and rapid heartbeat at low doses of 5ml or more. Many people also experience allergic reactions to clove oil.


  • Killing fungi with clove oil, bleach or biocides will do little to prevent or address the mould problem
  • Fungi and their spores are everywhere on earth from the Arctic to the Antarctic, they are nature’s greatest decomposers.
  • The focus of mould remediation is to contain the area, remove the mould and address the source of moisture
  • Fungi need a source of food (most building materials are ideal) and moisture to grow, though spores can lay dormant for many years

Having studied mould remediation both in Australia and abroad, the focus is to address the source of the moisture – excessive condensation, inadequate ventilation, inappropriate drainage, plumbing or roof leaks, flooding, high humidity and so on. Containment may need to occur in situations where there are extensive areas of water damage and this involves sealing the affected area and creating negative air pressure (scrubbers, HEPA filters and dehumidifiers are commonly required) to prevent further contamination of the building. Once this is established, water damaged building materials and furnishings may need to be replaced or remediated, and the mould needs to be removed.

How do I remove mould?

The most effective way to remove mould from non-porous surfaces is to use an 80% white vinegar to 20% water solution with a microfibre cloth which is either discarded after use or rinsed twice (in two separate buckets – one with 50:50 white vinegar to water ratio and the other with just clean water) to prevent recontamination. For porous surfaces such as unsealed timber, a 70% alcoholic solution is recommended. If however the mould has eaten into the substrate of the material, it may either need to be replaced or if the damage is superficial, a hydrogen peroxide solution (which requires a respirator be worn) maybe required to remove the stain. If  the amount of mould on a wall exceeds 1m2, an accredited mould remediator should be consulted. Refer to my Links page for a list of companies.