Does Alcohol Kill Mildew

Yes, alcohol can kill mildew, but with a few caveats:

✅ How Alcohol Kills Mildew

  • Isopropyl alcohol (rubbing alcohol) at 70% or higher concentration can kill surface mildew by denaturing proteins and dissolving cell membranes of fungi and mold spores.

  • It’s effective on non-porous surfaces like glass, tile, metal, and sealed wood.

⚠️ Limitations

  • Porous surfaces (like unsealed wood, drywall, or fabric): Alcohol may not penetrate deep enough to kill mildew at the root level, so it may grow back.

  • Heavy infestations: Alcohol may not be enough alone for large or embedded mildew problems.

🧽 How to Use Alcohol to Kill Mildew

  1. Mix 1:1 ratio of 70% (or higher) isopropyl alcohol and water.

  2. Spray directly on the mildew-affected area.

  3. Let it sit for at least 10 minutes.

  4. Scrub with a brush or cloth.

  5. Rinse and dry the area completely to prevent regrowth.

🧼 Alternatives That May Work Better

  • White vinegar: Naturally kills about 80% of mold species.

  • Hydrogen peroxide (3%): More effective on porous materials than alcohol.

  • Bleach: Kills surface mildew but is harsh and doesn’t work well on porous materials.

if the mildew is on a bathroom wall, here’s how to tackle it effectively depending on the wall type:

🚿 For Painted Drywall or Plaster

Alcohol works, but hydrogen peroxide or vinegar is usually more effective since mildew can grow into the porous surface.

✅ Recommended Steps:

  1. Ventilate the bathroom (open windows, use a fan).

  2. Spray 3% hydrogen peroxide directly on the mildew.

  3. Let it sit for 10–15 minutes.

  4. Scrub gently with a sponge or soft brush.

  5. Wipe clean with a damp cloth.

  6. Dry the area thoroughly with a towel or fan.

🧴 You can also use white vinegar (undiluted) instead — just don’t mix it with peroxide or bleach.

🧱 If the Wall is Tiled or Sealed

You’re in luck — isopropyl alcohol (70%+) works great on these surfaces.

✅ Use Alcohol Like This:

  1. Pour alcohol into a spray bottle.

  2. Spray mildew generously.

  3. Let it sit for 5–10 minutes.

  4. Scrub with a toothbrush or sponge.

  5. Wipe and dry thoroughly.

💡 Pro Tips to Prevent Return

  • Use a dehumidifier or run the bathroom exhaust fan after showers.

  • Wipe down walls regularly.

  • Keep an eye on leaks or drips that cause moisture buildup.

Native Environmental LLC is a industrial cleaning company located in Phoenix, Arizona offering a full list of industrial cleaning services including mold removal/remediation, asbestos removal/remediation, mercury spill clean up, silo cleaning and more. We can also help with industrial cleaning in Tempe, Tucson, Chandler, Gilbert, Glendale, South Phoenix, Central Phoenix, Scottsdale, Arizona and more.