For thousands of years, people have wanted to keep their skin soft and free of blemishes. Bathing and pale, clean skin were signs of wealth and privilege, though skin tanning is popular these days. What substances people have used, however, will surprise and disgust you: whipped ostrich eggs, donkey milk, crocodile excrement, gem stone poultices, crocodile glands, wolf's blood, mud, and even a lotion made from boar's brains. From homemade remedies...