But that’s not the only cause. Water high in iron, especially from wells or older pipes, can leave rusty marks that worsen with repeated washes. Certain haircare products, self-tanners, or tinted shampoos can transfer subtle pigments that only show up after drying. Even cleaning sprays with hidden bleach or peroxide can cause towel discoloration long after you’ve forgotten you used them.

What helped me most was prevention: I now use white towels when applying skincare, let products fully dry before touching fabric, use older towels for hair treatments, and installed a water filter to reduce iron levels. I’ve also learned to “read” the marks—large uneven patches usually mean bleaching, while small scattered dots often signal mineral deposits. And once the bleaching has occurred, it’s permanent. In those cases, I either repurpose the towel for cleaning, dye it a darker shade, or fully bleach it for a fresh, uniform look. Since discovering the cause, I’ve gone from replacing towels frequently to preserving them for much longer. Now, every time I see an orange patch, I don’t panic—I understand it. And sometimes, understanding something strange is the first step toward not letting it bother you anymore.