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Old skool flu epidemic photos show white cotton masks/aprons that would have probably been worn all day then boiled clean again. during/after the cleaning process it would be difficult to maintain sterility I guess, if not just getting minging blood stains etc in them all, plus the energy and resource required to do that on a use-once and chuck basis. Would avoid running out in an emergency though!
Can protective gowns and masks be washed and reused? Or is reusable PPE not a thing? Was it ever?