How to remove black mold in a toilet

Written by kaye wagner
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How to remove black mold in a toilet
Stangnant water attracts black mould spores. (Toilet bowl and bidet in a toilet image by terex from

Black mould spores are in the air inside most homes. The spores only grow, however, when they settle in a humid area. Stagnant water in a toilet bowl is a prime place for black mould to settle and reproduce. Homeowners who have a bathroom that they rarely use, or who seal up their house for a portion of the year, will likely see black mould growing inside their toilet bowl. Luckily, this can be removed easily without the need for hiring a professional.

Skill level:
Moderately Easy

Things you need

  • Work clothes
  • Rubber gloves
  • Breathing mask
  • Toilet cleaner
  • Long-handled scrubbing brush
  • Paper towels

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  1. 1

    Put on work clothes that will cover your arms, and rubber gloves to protect your skin from the mould. Wear a breathing mark to prevent you from inhaling black mould spores. If inhaled, these spores can settle and grow inside your lungs.

  2. 2

    Spray a toilet cleaner that contains bleach over the entire toilet. The black mould you see is actually hundreds of spores, which on their own can be invisible. To get rid of all of the black mould spores, you will need to clean even areas that do not appear to have mould. Let the bleach-based cleaner sit for at least 15 minutes.

  3. 3

    Scrub the entire toilet with a long-handled toilet scrubbing brush. Pay special attention to the black mould growth.

  4. 4

    Flush the toilet to rinse away the black mould and the bleach residue. Wipe the outside of the toilet with paper towels.

  5. 5

    Throw away your rubber gloves and the long-handled scrubbing brush. This cleaning process has removed the black mould spores but has not destroyed them. Throw away all of your cleaning utensils to prevent the black mould from spreading to other areas of your home.

Tips and warnings

  • Always open a window or a door to let in more air when using bleach to avoid being overcome by the fumes.

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