How to remove mould & mildew from a window sill

Written by amanda flanigan Google
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How to remove mould & mildew from a window sill
Mold grows on a variety of surfaces, including windowsills. (Two tomatoes lies on the window. image by Elena_Pazhina from

Condensation can occur on the inside of your windows. The condensation runs down the windowpane toward the windowsill, where it sets for an extended period. Excess moisture on windowsills provides a perfect breeding ground for fungus such as mould and mildew. Mold and mildew will stain and deteriorate the windowsill while filling the area with an unpleasant musty odour. Remove all mould and mildew growing on the windowsill as soon as possible to prevent the fungus from spreading.

Skill level:

Things you need

  • Spray bottle
  • White vinegar
  • Cloths
  • Borax
  • Sponge
  • Towel

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  1. 1

    Open the window during the mould and mildew removal process. Check for any mould and mildew growing on the rubber seal of the window.

  2. 2

    Fill a spray bottle with white vinegar. Spray all visible mould and mildew with the white vinegar. Allow the vinegar to sit on the fungus for 10 to 15 minutes.

  3. 3

    Spray white vinegar on a clean cloth. Wipe the surface mould and mildew off the windowsill -- as well as any other areas of the window with fungus growth -- with the white cloth. Vinegar is an all-natural deodoriser that will kill mould and mildew.

  4. 4

    Mix 1 gallon of warm water with 1 cup of borax. Saturate a sponge in the mixture and wring out the excess liquid. Wash the windowsill with the sponge. Rinse the mixture off the windowsill with a clean, damp cloth. Wipe dry with a towel.

Tips and warnings

  • Alternatively, mix equal parts water and liquid dish soap in a small container. Dampen a cloth in the mixture. Wipe the mould off the windowsill with the damp cloth. Dampen a clean cloth in cool water. Wipe the mixture off the windowsill with the cloth. Dry with a towel.

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