How to clean black mould off the walls in a bathroom

Black mould on your bathroom walls is not just unsightly; if left unattended, it can be bad for your health. Black mould should be removed from your bathroom walls at first sight, before fast-growing mould spores have a chance to spread. Use supplies from home or the shop to clean and remove black mould from your bathroom walls. Once completed, diligently keep your walls clean to help prevent the return of black mould.

Mist the bathroom walls where black mould exists using a spray bottle filled with plain water.

Prepare a cleaning solution for the first part of mould removal: Fill a bucket with hot water and add 60 to 120 ml (1/4 to 1/2 cup) of liquid disinfectant cleaner. Mix the solution to create some soap suds.

Dip a clean cloth or scrub brush into your disinfectant cleaning solution. Scrub your bathroom walls that have the black mould infestation. Remove as much black mould as possible. Change to a fresh cleaning solution when the water starts to look dirty, and continue washing your walls until black mould is no longer visible.

Combine 1 part hydrogen peroxide with 2 parts water in a bucket. Saturate a clean cloth with the peroxide solution and wipe down the walls where the black mould existed. Rinse your cloth in the peroxide mixture frequently to ensure you are getting the peroxide on the wall surfaces. Wash surrounding areas as well. The peroxide mixture will kill any remaining invisible mould spores and help to prevent its return.

Dry your walls completely using a clean dry cloth. Open windows, as well, to aid in the drying process.


Substitute chlorine bleach or isopropyl alcohol for the hydrogen peroxide if necessary when killing mould spores. Use a ventilating fan each time you shower. Keeping moisture to a minimum will help prevent the development of black mould.


Excessive black mould infestation on your bathroom walls can spread to the insides of walls. Consult a professional for mould removal as this type of mould can be very toxic. Wear safety goggles and rubber gloves during the black mould removal process.

Things You'll Need

  • Spray bottle
  • Water
  • Measuring cups
  • Disinfectant cleaning liquid
  • Bucket
  • Cleaning cloths or scrub brush
  • Hydrogen peroxide
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About the Author

Mary Ylisela is a former teacher with a Bachelor of Arts in elementary education and mathematics. She has been a writer since 1996, specializing in business, fitness and education. Prior to teaching, Ylisela worked as a certified fitness instructor and a small-business owner.