If you think the stubborn yellowish stains around the neck of your white cotton T-shirts are from sunscreen, you might be surprised to hear it’s not actually the cream that’s the culprit, it’s the water you use for washing.
The metal ions react with the active ingredients in the cream and turn it yellow (therefore they appear after washing). Water types and creams vary, so staining may not always be a problem. Regular washing will eventually fade the marks
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