During summer, warm nights cause us to sweat more than usual, resulting in unsightly yellow pillow stains that can be hard to budge.
Pillows turn yellow because of moisture - this, of course, includes perspiration but also wet or greasy hair, saliva, lotions and oils on the skin.
Even the best pillows will change colour over time, but how on earth do you get rid of these disgusting-looking stains?
Thankfully, the cleaning experts at Lifehacker have provided the top tips to make your pillows feel fresh, clean and like new again, The Mirror reports.
The gurus say that the most common reason for yellowing pillows is sweat. When moisture seeps through a pillowcase and onto the pillow beneath, it can cause staining, especially during summer.
Lifehacker's experts state: "In addition to sweat, your hair may be the culprit: Specifically if it's particularly oily, or you often go to bed with wet or damp hair.
"Some types of makeup and skincare products can also be behind the yellow stains. It could also be drool. Putting a waterproof pillow protector on before your pillowcase can help prevent a lot of discolouration."
There is a handy hack that could remove them - and it involves an ingredient from the supermarkets.
Lifehacker gurus said: "You can start off by spot treating the stains with either a store-bought stain removal spray or cream or with a paste made out of a mixture of baking soda and water."
You can pick up a carton of baking soda for as little as 65p at Tesco, £1.75 from Wilko or £1.65 on Amazon.
The experts claim you'll want to act fast to remove stains from your pillows, as the longer they sit there, the harder they'll be to remove when you do try to clean them.
Pillows should also be washed twice a year, regardless of staining, so hopefully this will keep the yellow marks at bay.
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