We all know that human bodies, especially our own, can be disgusting at times, but we'd rather not be reminded of it
It can be unpleasant to change your linens and discover that your once-perfectly white pillows are now covered in a web of yellow and brown-ish stains.
There's a legitimate explanation for the stains' appearance, and they may be removed.
Pillows can turn yellow for a variety of reasons, but sweat is the most prevalent culprit.
In theory, regardless of stains, you should wash your pillows at least twice a year.