What traditional use was made of the dried and sterilized droppings of the *uguisu*?

Answer

It was used as a cosmetic remedy for skin brightening and wrinkles.

Known as *Uguisu no fun*, the dried and sterilized droppings were traditionally utilized as a cosmetic remedy, believed to help brighten skin and reduce fine wrinkles, and also as a cleaner for delicate fabrics.

What traditional use was made of the dried and sterilized droppings of the *uguisu*?
namebirdanimaltranslationUguisu