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How to Get Mildew Out of Wool

Surface mold — vinegar soak, oxygen bleach if allowed, dry fully.

How old is the stain?

Fresh Mildew stain on Wool

Before you startAlways test any treatment in an inconspicuous area first, and check the garment's care label before you begin.
  1. Brush off loose mildew outdoors if possible.
  2. Soak in a solution of white vinegar and water.
  3. Launder with an oxygen-based bleach if the care label allows.
  4. Dry completely — in sunlight if possible.

Don’t do this

  • Extensive or deep mildew on valuable items calls for a professional.

Sources: HowStuffWorks; Bob Vila

Dried / set Mildew stain on Wool

Before you startAlways test any treatment in an inconspicuous area first, and check the garment's care label before you begin.
  1. Work in a ventilated area and wear a mask and gloves.
  2. If the item is valuable or the mold is widespread, do not treat at home — take it to a professional cleaner.
  3. For washable items with surface mold only: soak with white vinegar or borax per label directions, then launder and dry fully.

Don’t do this

  • Do not inhale mold spores or handle extensive mold without protection.

Sources: Bob Vila

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Frequently asked questions

Is a fresh Mildew stain easier to remove than a dried one?

Almost always. Treat Mildew as soon as possible — dried stains need rehydrating and longer treatment times, and some stains set permanently with heat or age.

Should I test the treatment on Wool first?

Yes. Always test any treatment in an inconspicuous area of the Wool first, and check the care label before you begin.

Safety rules for every treatment
  • Test every treatment in an inconspicuous area first — some treatments can fade dyes or damage finishes.
  • Blot a wet stain; never rub it. Rubbing pushes the stain deeper into fibers.
  • Check the garment's care label and follow it — skip any step the label prohibits.
  • Never put the item in the dryer until the stain is completely gone; heat sets most stains.
  • Never mix ammonia with chlorine bleach — the fumes are toxic and dangerous.
  • Never use chlorine bleach on rust — it can intensify the stain.
  • Rubbing alcohol is flammable and can fade some dyes; spot-test first and ventilate the area.
  • Acetone dissolves acetate, triacetate, and modacrylic fabrics — check the fabric label first.
  • Use cold water first on blood and other protein stains; hot water sets them.
  • When in doubt — a valuable, vintage, or delicate item — take it to a professional cleaner instead.

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