Why does borax hurt Leviathans in 'Supernatural'?

Borax or Sodium Borate is a weapon that can be used against Leviathans. It was discovered by chance when Sheriff Jody Mills was scrubbing the floor of Bobby's cabin and spilt some which dripped down on Chet. Since Borax is in almost every cleaning product, it can be easily found. read more

While borax causes them extreme pain, it cannot kill them and is usually used as a prelude to decapitation, with the heads disposed of a good distance from the body or simply to escape while the Leviathan is in pain. read more

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