Bedsheets should be washed about once a week,[6] using low-temperature water and drying settings.[6] Warm water can be used to eliminate coffee stains, urine or allergens, such as dust mites.[6] Using fabric softeners is not recommended, as they leave behind residue that decreases the fabric's breathability.
PILLOWCASE
The second step is to become familiar with how a duvet cover operates. Duvets are designed to fit comfortably within the cover, similar to how a pillow fits inside a pillowcase. The duvet is held in place by snaps, buttons, or ties, resulting in a single, secure blanket.
And if you are concerned with style, one thing to keep in mind is that once fitted to a pillow or a mattress, sateen and percale cotton bedding keep its shape much better, resulting in a cleaner wrinkle-free look.