Separate by color. Prior to washing, divide your bedding into two or more piles: light, dark, and colorful. Washing dark or vibrant sheets with white ones may cause fading or bleeding, resulting in a dull, faded appearance. Apart from sorting by light and dark, it's also best to separate different colors, such as red and blue. As long as you don't mix your flannel bedding, you shouldn't encounter any issues during washing.
Pre-treat flannel sheets with vinegar. When washing your flannel bedding for the first time, add half a cup (120 ml) of white vinegar. The acidity in vinegar can prevent pilling. It also has the added benefit of locking in colors, making them less prone to fading in future washes. Pilling is small clusters of loose fibers on the surface of the flannel. If flannel is not properly maintained, pilling will occur. Adding a bit of vinegar to the washing process occasionally can also help keep your sheets fluffy and clean.
Set the washing machine to low temperature. It's best to wash your flannel bedding with warm water; some manufacturers even recommend using cold water. Low temperature is gentler on both the fabric structure and color. High temperatures will cause the fine fibers in the flannel to shrink, resulting in pilling and an uncomfortable sleep experience.
Add a small amount of mild detergent. Choose a detergent specifically designed for delicate fabrics. Avoid using too much, as some chemicals in detergents can cause fabrics (especially soft flannels) to fade. A color-protecting detergent is useful in maintaining the bold appearance of your bedding. Place colored detergent in a washing ball or dispenser in the washing machine so you don't have to pour it directly onto the sheets.
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