How to deal with mould in a bathroom
Bathroom mould grows where moisture stays. Small surface patches on tiles, grout and sealant can usually be cleaned, but recurring mould points to ventilation or leak problems.
Safety classification
Safe homeowner task
This guide covers safe first actions only. It is not a licence to perform regulated work or enter a dangerous area.
What to do
- 1
Protect yourself
Wear gloves, eye protection and a mask, and open windows. People with asthma or allergies should avoid the cleaning.
- 2
Clean non-porous surfaces
Use a detergent solution or a household mould product according to its label. Never mix bleach with other cleaners.
- 3
Dry the area
Wipe surfaces dry and run the exhaust fan during and after showers.
- 4
Improve ventilation
Check the exhaust fan works and vents outside, and leave the door or window open after bathing.
- 5
Watch where it returns
Mould that returns in the same place, behind sealant or outside the shower may mean water is escaping through failed grout or waterproofing.
When to stop
- Mould covers a large area or keeps returning
- Tiles are loose, drummy or grout is cracking
- Walls outside the shower are damp or stained
- Mould is in plasterboard, carpet or the ceiling
Waterproofing
Prepare the problem, safety status and location once. The matching category and service will be pre-filled.
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