Mold on curtains? EPA, CDC recommend how to clean them safely

Why mold appears on curtains

The main cause is excessive humidity. When warm indoor air hits cold window glass, it forms condensation. If curtains touch the damp surface or are poorly ventilated, conditions become favorable for mold growth.

According to the EPA, condensation on windows may indicate high indoor humidity. Under these conditions, mold can develop not only on curtains but also on furniture, clothing, and other textile products.

How to clean mold from curtains properly

First, check the care label. Not all fabrics can withstand machine washing, while silk, velvet, and materials with special coatings may require professional cleaning.

Protect yourself before you start. The CDC recommends that people cleaning mold wear protective gloves, well-fitting goggles, and at least an N95-rated respirator.

People with asthma, chronic lung conditions, mold allergies, or weakened immune systems should not clean mold themselves.

Preparation and washing

Damp and mold specialist Damian Wallis, speaking to Homebuilding & Renovating, recommends handling affected fabric carefully to avoid spreading mold spores.

Follow these steps to clean the curtains:

1. Carefully take down the curtains. Do not shake them or brush them while dry. Place the fabric in a bag before carrying it to the washing area.

2. Treat the stains. If the care label permits, use a pretreatment product or an oxygen-based stain remover suitable for the material. Test it on an inconspicuous area first.

3. Wash the curtains. Use the highest water temperature the manufacturer allows and an appropriate detergent.

4. Dry the fabric completely. Hang it in a well-ventilated area. Do not rehang damp curtains on the curtain rod.

Do not automatically set the washing temperature to 60°C without checking the care label, as this could damage delicate fabrics.

Does vinegar help remove mold?

Vinegar is sometimes used to pretreat fabric with minor mold stains. However, this method does not guarantee complete mold removal, especially if the growth has penetrated deep into the fibers.

According to Wecasa, the following method can be used to spot-clean curtains:

1. Mix white vinegar with water in a 1:4 ratio.

2. Test the solution on an inconspicuous area of the fabric.

3. Spray the mixture onto affected areas if the material can tolerate it.

4. Leave it for approximately 20 minutes.

5. Gently blot the treated areas with a clean cloth without rubbing the stains.

After cleaning, let the curtains dry completely. If the fabric is machine-washable, you can wash it afterward according to the manufacturer's instructions.

Important: Never mix vinegar with chlorine bleach. This combination can release toxic gas.

When should you replace curtains?

Not all fabrics can be cleaned completely. If mold or a persistent musty smell remains after washing, consider taking the curtains to a professional dry cleaner.

Mold can penetrate deep into porous materials, making it difficult or sometimes impossible to remove completely.

If the contamination is extensive and the fabric is damaged, replacing the curtains is the safer option. Even after successful cleaning, stains may remain.

How to prevent mold from returning

To prevent mold from returning, eliminate the underlying cause of excessive moisture.

Here are some steps to take:

• Regularly wipe condensation from windows

• Ventilate the room and ensure good air circulation

• Avoid prolonged contact between curtains and damp surfaces

• Check the condition of windows and ventilation systems

• Use a dehumidifier if necessary.

Ideally, keep indoor relative humidity at 30–50% and avoid letting it stay above 60% for extended periods.

If condensation continues to build up even after ventilation, investigate possible sources of excess moisture. Without addressing the underlying problem, mold may return.

Read also: Mold on windowsills or in bathroom? EPA and CDC say how to remove it