Picture taken from Google-:
There is legend from long ago that people notice that clothes washed in the river from Mont Salo are the cleanest. On Mount Sapo religious ceremonies takes place where animals are sacrificed. That is the animals are burnt as an offering to the goods. Someone notices that is the cooked animal fat mixed with wood ashes that makes the clothes all clean. Today many soaps are still mad from animals fat and wood ashes.
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