Camel Pee. Yes, that's correct.

Rakuda no zu

• It is well known to scholars of Dutch knowledge that processed urine of a camel is a miracle medicine to cure a person in critical condition. If a child puts this picture up and always takes a look at it, it will help improve the condition of rashes and smallpox, and an evil being will disappear from the child's mind. Thunder monsters are so fearful of camels that a thunder will never hit where a camel is present. Therefore, the Dutch use a picture of a camel as a charm to protect them from thunders.

Stolen in its entirety from HERE