How to get this sweat/salt water stain out of this hat? : r/howto

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Anyone know how to get these stains out of hats. Not from salt

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How to get this sweat/salt water stain out of this hat? : r/howto

Anyone know how to get these stains out of hats. Not from salt

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How to remove sweat stains from a hat? It's only on the inside for