Another stain on the bedding - possibly aged old dried blood

Another stain on the bedding - possibly aged old dried blood - Picture of Hotel Canal, Venice - Tripadvisor

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My cousin slept on this mattress for 2 nights before stripping it only to notice the dried blood (La Quinta - Downtown Denver, CO). : r/Wellthatsucks

Blood stains on duvet and bed. How do I get them out? : r/CleaningTips

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How To Get Blood Out Of Sheets, 5 Easy Steps

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