How to Get Mildew Out of Clothes Guide

Understanding Mildew: What It Is and Why It Grows on Clothes

Mildew is a type of fungus that thrives in damp, dark, and warm environments. Unlike mold, which typically appears as black spots or larger patches, mildew usually looks like a thin, powdery coating or small dark specks on fabric surfaces. The word "mildew" comes from Old English and literally means "honey dew," referring to the sticky residue these fungi leave behind.

Mildew grows when moisture levels exceed 55% humidity and temperatures range between 77°F and 86°F, though it can develop in cooler conditions as well. Certain fabrics are more susceptible than others. Natural fibers like cotton, linen, and wool absorb moisture more readily than synthetic materials, making them prime targets for mildew growth. Clothes stored in basements, closets without ventilation, or packed in plastic bags face higher risks of developing mildew within 24 to 48 hours of exposure to damp conditions.

The fungal spores that cause mildew are present everywhere in our environment—on surfaces, in the air, and on fabric. They remain dormant until conditions become favorable for growth. A single spore can multiply rapidly, creating visible colonies in just a few days. This is why catching mildew early matters significantly.

Environmental factors play a major role in mildew development. Humidity, temperature, air circulation, and fabric composition all influence whether mildew will appear. Coastal areas with naturally high humidity levels report more clothing mildew problems than dry climates. Similarly, people who live in older homes with poor ventilation or those who use unheated storage spaces face greater challenges.

Practical takeaway: Check stored clothes regularly and maintain indoor humidity below 50% to prevent mildew formation. Use a dehumidifier in damp areas, and ensure closets have adequate air circulation by leaving doors slightly open or installing ventilation fans.

Immediate Steps to Take When You Discover Mildew on Clothes

Upon discovering mildew on clothing, your first action should be to isolate the affected garment from your other clothes. Place it in a separate plastic bag to prevent spores from spreading to nearby items. Do not immediately throw the clothes in the washing machine with other laundry, as this can transfer fungal spores to unaffected garments.

Before washing, take the item outside to your yard or a well-ventilated area. Brush off loose mildew gently using an old toothbrush or soft-bristled brush. This step is crucial because it removes visible spores before they become further embedded in the fabric during washing. Brush in a downward motion to help spores fall away from the garment. Wear a dust mask during this process if you're sensitive to mold spores or have respiratory issues.

For light mildew stains, sunlight exposure is one of the most effective natural solutions. The UV rays in sunlight kill fungal spores and help bleach out discoloration. Hang the garment in direct sunlight for several hours. Research from the American Cleaning Institute shows that 2 to 3 hours of direct sunlight exposure can eliminate up to 99% of surface mildew. However, be aware that prolonged sun exposure may fade colored fabrics, so check the garment periodically.

If the mildew smell persists after brushing and sun exposure, the next step involves treating the fabric before a full wash. Create a solution using white vinegar, which has natural antifungal properties. Mix one cup of white vinegar with one gallon of water. Soak the affected area or the entire garment in this solution for 30 to 60 minutes. Vinegar's acidity helps kill remaining fungal spores and removes odors.

For delicate fabrics or items prone to color fading, consider using a mixture of lemon juice and salt instead. The citric acid in lemon juice acts as a natural fungicide. Mix fresh lemon juice with salt to create a paste, apply it to mildewed areas, and let it sit for 10 to 15 minutes before rinsing with cool water.

Practical takeaway: Act quickly when mildew is discovered. Isolate the garment, brush off loose spores outdoors, expose the item to direct sunlight for several hours, and pre-treat with vinegar or lemon juice before washing to maximize removal effectiveness.

Washing Techniques That Remove Mildew Effectively

After pre-treatment, washing the garment properly is essential for complete mildew removal. Use the hottest water temperature that the fabric can safely tolerate—check the garment's care label for guidance. Hot water kills fungal spores more effectively than cold or warm water. According to research published in the Journal of Applied Microbiology, washing clothes at 140°F (60°C) or higher eliminates 99.9% of fungal spores, while 104°F (40°C) water eliminates only about 60%.

Select a laundry detergent that contains enzymes or antifungal ingredients. Many modern detergents include protease and amylase enzymes that break down organic matter where fungi hide. Some people prefer using specialized laundry treatments designed to eliminate odors and mildew. Biz, OxiClean, and similar oxygen-based cleaners work well for mildew removal on whites and colorfast fabrics.

For stubborn mildew on white cotton or linen items, bleach is highly effective. Add one-half to one cup of chlorine bleach to the wash cycle, depending on the load size and mildew severity. Chlorine bleach is a powerful fungicide that kills mildew spores and prevents regrowth. However, bleach damages or discolors many fabrics, so use it only on items that can tolerate it. Always test on a hidden area first.

For colored garments or delicate fabrics that cannot tolerate chlorine bleach, oxygen bleach offers a gentler alternative. Oxygen bleach (such as hydrogen peroxide-based products) kills mildew effectively without the harsh effects of chlorine. It also works on a wider range of fabrics and colors. Use according to product instructions, typically adding it to the wash cycle along with regular detergent.

Washing machines themselves can harbor mildew spores, potentially recontaminating clothes. Run an empty wash cycle with one cup of white vinegar or bleach once monthly to clean the machine's interior. This maintenance step prevents mildew from building up in rubber gaskets and drum crevices where spores can hide.

Practical takeaway: Wash mildewed clothes in the hottest water safe for the fabric, use enzyme-based or oxygen-based cleaners, and consider running a cleaning cycle in your washing machine monthly to prevent mildew spore buildup.

Drying Methods That Prevent Mildew Regrowth

How you dry clothes after washing significantly impacts whether mildew returns. The goal is to remove moisture as quickly as possible while minimizing the time clothes spend damp. Air-drying in sunlight is ideal when weather permits. Hang clothes on an outdoor clothesline in direct sun, which combines two mildew prevention methods: heat and UV radiation. Clothes dried in sunlight rarely experience mildew problems afterward.

If air-drying outdoors isn't possible, use a clothes dryer set to a medium or high heat setting appropriate for the fabric. Machine drying is preferable to line-drying indoors, as the heat and tumbling action extract moisture more thoroughly. Set the dryer to a temperature that matches the fabric's care requirements—typically 160°F to 200°F for most household items. A 45 to 60-minute drying cycle usually removes sufficient moisture to prevent mildew growth.

Never leave damp clothes in a pile or damp laundry basket for extended periods. Moisture trapped in bunched-up fabric creates ideal conditions for mildew to develop within hours. This is one of the most common scenarios where mildew reappears on supposedly clean clothes. If you cannot dry clothes immediately after washing, hang them loosely to allow air circulation between garments.

For indoor air-drying, select a room with good air circulation and low humidity. Open windows and doors if weather permits, or run a fan and dehumidifier to reduce moisture levels. Ideally, relative humidity should