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More info × Group 28 Thank you for subscribing! We have more newsletters Show Me No thanks, close See our Privacy Notice Have you ever glimpsed your pillow peeking out from its cover, showing off ugly yellow stains, and wondered how they appeared? Even if you keep your home spotless, you might still struggle with these persistent marks on pillows, leaving you feeling like your bedding is never quite pristine, despite constant washing. So, what causes these baffling blemishes, and, more importantly, how do we get rid of them for good? Don't panic, .