From Urea: - Wikipedia, the free encyclopedia

"An ingredient in some hair conditioners, facial cleansers, bath oils, and lotions.
(...) A flame-proofing agent (commonly used in dry chemical fire extinguishers as Urea-potassium bicarbonate)
(...) An ingredient in many tooth whitening products
(...) A cream to soften the skin, especially cracked skin on the bottom of one's fee"

However, even if might work, it still sound mighty gross!