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Just by knowing how to wash my hands, medicine. Up until 20th century.
Wash the wound with soapy water, apply cloth that has been boiled. Yeah that should have a better survival rate than most of human history.
Soap is animal fat and what in a survival situation?
Leach wood ashes with water to make lye. Soap is easy
Yep, IIRC hardwood is what you want to be using to make the lye
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