This curiosity came after I noticed this on shirts that are washed and kept in the wardrobe, untouched for a long period of time (more than 2 months). Whereas the ones I regularly wear and wash do not have these visible stain.
I have tried googling why it is happening but the results simply show that it is due to oil/sweat build up and it only leads to more questions. Like if that’s the case why does it only happen after a long period of time when left alone, why does it happen to clothes that are washed before storage. Why does it not happen to clothing that are worn and washed regularly?
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The cause of yellowing stains is purely sweat and oils from your body.
Have you ever seen old pillows when you take the pillowcases off, they’re yellowed or have big yellow spots? That’s sweat and oils from your body. Same with some mattresses -if it’s not urine of course (it honestly depends on how clean the individual is, of course by how often they change bedsheets, shower, or how much they naturally sweat).
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