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In fact, yellowed pillowcases are quite a common occurrence. Constant contact with your face, hair, and skin throughout the night causes small amounts of moisture, sweat, and natural oils to accumulate in the fibers of the pillow and pillowcase.

In this article, we explain why yellow stains appear, how to clean yellowed pillowcases, and when you should consider replacing your pillow with one of the best sleeping pillows.

Why do pillows turn yellow?

Yellow stains on pillows don't appear overnight. In most cases, they are the result of the gradual buildup of natural substances produced by the body during sleep.

Night sweats

While you sleep, your body naturally regulates its temperature through perspiration. Even if you don’t notice it, it’s normal to sweat throughout the night.

Over time, this moisture seeps through the pillowcase and comes into contact with the pillow filling. When it dries, it can cause stains that leave the pillowcase yellowed or give the pillow itself a yellowish tint.

Natural oils for skin and hair

The skin naturally produces sebum, an oily substance that protects and moisturizes the skin. These oils can transfer to your pillowcase and pillow while you sleep.

In addition, face creams or hair products applied before bedtime can also contribute to the appearance of dark spots.

Saliva while sleeping

Some people produce small amounts of saliva at night, especially when sleeping on their side or on their stomach. This moisture contains enzymes and bacteria that can cause stains on pillows.

Ambient humidity

Sleeping with wet hair, keeping your bedroom poorly ventilated, or living in humid environments can accelerate the appearance of stains. The combination of moisture and oxygen triggers a process called oxidation, which causes fabrics to turn yellow.

How do you clean yellowed pillowcases?

If your yellowed pillowcase has lost its original whiteness, there are a few simple solutions that can help restore its color:

• Wash the pillowcase in hot water —whenever the fabric allows, washing the pillowcase at higher temperatures can help remove sweat, oil, and bacteria (for knit pillowcases, do not wash at temperatures above 30 degrees);
• Baking soda —baking soda is an effective ally in removing stains. Mix baking soda with a little water to form a paste and apply it to the stained area of the pillowcase. Let it sit for about 30 minutes before washing as usual.
• White vinegar - White vinegar helps eliminate odors and stains. It can be added during the wash cycle or applied to the most affected areas before putting the pillowcase in the washing machine.

Important note: A pillow with a memory foam core should never be placed in the washing machine, as this material can degrade and lose its properties. Only the pillowcases and removable covers should be washed, always following the manufacturer’s instructions.

How can you prevent yellowing of the cushions?

Prevention is always the best strategy. There are a few simple steps you can take to help keep your pillows clean for longer.

• Change your pillowcase regularly—ideally, you should wash your pillowcase at least once a week;
• Use a pillow protector—just as there are mattress protectors, there are also pillow protectors that act as a barrier against sweat, oils, and moisture;
• Sleep with dry hair—avoiding sleeping with wet hair significantly reduces moisture transfer to the pillow;
• Keep the room well-ventilated—a cool, well-ventilated environment helps prevent moisture from building up overnight.

When should you replace your pillow?

Even with proper care, no pillow lasts forever. If your pillow has stubborn stains, an unpleasant odor, or has lost its original shape, it may be a sign that it’s time to replace it.

On average, experts recommend replacing your pillow every 1 to 2 years.

In addition to the spots, other signs include:

• Loss of neck support;
• Discomfort upon waking;
• Difficulty in returning to its original shape;
• Accumulation of odors.

In these cases, investing in high-quality pillows can significantly improve the quality of your sleep.

Best pillows for sleeping

A pillow should provide adequate support for the neck and head, maintaining proper spinal alignment while you sleep.

When choosing a pillow, it is important to consider:

• The position in which you usually sleep;
• Desired firmness level;
• Breathable materials;
• The pillowcase is easy to wash.

High-quality cushions also tend to be more resistant to wear and tear and staining.

Finding yellow stains on your pillows may seem concerning, but in most cases, it’s simply a natural result of daily use. The good news is that with simple steps like washing your pillows regularly, cleaning yellowed pillowcases, and maintaining good bedding hygiene, you can extend the life of your pillows.