Mold

2 August 2026 4 min

What Kills Mildew and Mold? The Best Ways to Remove Both

Written by

Aldian A.F. Bio-On Content Researcher

EXPERT REVIEWED

Rafi Candra, M.Sc Master of Health Science

The things that kill mildew and mold are mold-killing products, heat, sunlight, and dry conditions, but the most important factor is removing the moisture source that allows them to survive. Mold and mildew are both fungi. While certain cleaning solutions can kill them on contact, dead mold can still leave behind allergens and particles. That means successful mold removal requires both killing the growth and physically removing the contamination.

Mold and mildew can be killed with solutions such as hydrogen peroxide, appropriate mold cleaners, and some disinfectants, but cleaning alone will not stop regrowth if moisture remains.
The most effective long-term solution is removing the mold, drying the affected area completely, and fixing the humidity or water problem causing the growth.

What Kills Mildew and Mold?

Several substances and environmental changes can kill mold and mildew, but their effectiveness depends on the surface, severity, and location of the growth.

1. Hydrogen Peroxide

Hydrogen peroxide is one of the commonly used options for killing mold on household surfaces.

It works by breaking down fungal structures through oxidation.

It may be useful for:

Small mold spots
Hard surfaces
Bathroom areas
Some fabrics

However, hydrogen peroxide may not fully remove mold growing deep inside porous materials such as drywall, carpet padding, or wood.

2. Mold-Killing Cleaning Products

Commercial mold removers are specifically designed to treat fungal growth.

A good mold cleaner may contain ingredients that help:

Kill active mold growth
Remove stains
Reduce surface contamination

These products are generally more reliable than random household mixtures because they are formulated for specific surfaces.

Always follow the product instructions and avoid mixing different cleaning chemicals.

3. Bleach (With Limitations)

Bleach can kill mold on some non-porous surfaces, such as:

Tiles
Glass
Certain bathroom surfaces

However, bleach is often less effective on porous materials because it may not penetrate deeply enough into materials where mold roots can exist.

For example, mold growing inside:

Drywall
Wood
Carpet
Ceiling materials

may return even after the surface looks cleaner.

Bleach also does not fix the moisture problem that caused mold growth in the first place.

4. Heat and Dry Conditions

Mold needs moisture to survive and continue growing.

One of the most effective ways to stop mold is creating a dry environment.

Helpful methods include:

Using a dehumidifier
Increasing ventilation
Drying wet materials quickly
Repairing leaks
Reducing condensation

Drying does not instantly remove existing mold, but it prevents conditions that allow mold colonies to continue expanding.

5. Sunlight and UV Exposure

Sunlight can help slow or reduce fungal growth because ultraviolet (UV) light can damage fungal cells.

This may help with some items that can safely be placed outdoors, such as:

Fabrics
Certain furniture items
Small household objects

However, sunlight is not a complete solution for indoor mold problems because it cannot reach mold growing behind walls, under floors, or inside materials.

What Does NOT Really Kill Mold?

Many popular DIY solutions are misunderstood.

Vinegar

Vinegar may affect some types of mold on certain surfaces, but it is not a guaranteed solution for all mold problems.

It also may not work well when mold has penetrated porous materials.

Baking Soda

Baking soda can help absorb odors and can assist with cleaning, but it usually does not eliminate established mold growth by itself.

Air Fresheners

Air fresheners only cover mold odors temporarily.

They do not kill mold or remove the source.

A musty smell usually returns if the mold problem remains.

Why Killing Mold Alone Is Not Enough

Many people think the solution is simply finding a product that kills mold. However, mold problems usually happen because there is an ongoing moisture issue.

For example:

A leaking pipe keeps a wall damp
AC condensation keeps a ceiling wet
High humidity keeps a room moist

Even if you kill the visible mold, new growth can appear if the environment remains suitable.

A complete mold solution requires:

Finding the moisture source
Removing existing mold
Drying the affected area
Preventing future moisture buildup

When Should You Avoid DIY Mold Removal?

DIY cleaning may be suitable for small surface areas, but professional help may be better when:

Mold covers a large area
Mold keeps returning
Growth is inside walls or ceilings
There is water damage
The HVAC system may be affected
The affected material is porous and difficult to clean

Materials such as drywall, insulation, and heavily contaminated carpet may need removal because mold can grow deep inside them.

The Bottom Line: What Kills Mildew and Mold?

The exact answer is that mold and mildew can be killed by appropriate mold cleaners, hydrogen peroxide, certain disinfectants, and dry conditions that remove the moisture mold needs to survive.

However, killing mold is only one part of the solution. If you do not fix the moisture source, mold can return even after successful cleaning.

For small surface growth, careful cleaning and drying may be enough. For widespread, recurring, or hidden mold problems, the safest approach is to remove the contamination properly and address the underlying moisture issue.

Professional guidance matters. Our articles are developed through careful research and reference credible sources. As individual health circumstances differ, this information is intended to complement—not replace—the guidance of a qualified healthcare professional.