Borax

Name	Sodium borate aka Borax
Manufacturer
Powers	Temporarily burns and weakens Leviathans.
Location/Owners	Supermarkets around the world.
Episodes	First Appearance: 7.06 Slash Fiction Last Appearance: 8.01 We Need To Talk About Kevin

The thing to know about Leviathan is these monsters are as old as time, and strong as all get-out. Sodium borate – commonly known as borax. Decapitation… Splash them liberally. Repeat. …is the key. Then put that head in a box. These are the Superman of monsters. But don’t use… ...from the black hole of Purgatory. Send it to the moon if you can. They die. They can shapeshift… They don’t die easy. Take your face, your memory – the works. The top boss is Mr. Dick Roman. He runs the show. – Frank Devereaux, 7.20 The Girl with the Dungeons and Dragons Tattoo

History

Borax or sodium borate is a compound found in most cleaning supplies and is a salt of boric acid. It's use as a weapon against the Leviathan came upon happenstance, when Sheriff Jody Mills spilled a bucket containing the cleaning solution, which dripped through the floor boards of Rufus's Cabin onto the Leviathan, Chet, causing an acidic reaction to his body. The effect, however, is only temporary, but can allow for enough time to get close enough and decapitate the Leviathan.

Episodes

7.06 Slash Fiction

As Bobby is testing out various methods to kill the Leviathan Chet, frustrated that nothing appears to work, Chet begins mocking Bobby telling him how he plans on eating him. Bobby raises his machete, when several drops of a liquid fall from the ceiling onto Chet's arm and burn his skin, causing Chet to panic and plead for Bobby to get it off of him. The skin on Chet's arm turns yellow, then black, and black steam rises. Another drop falls and Chet's arm continues to burn, causing more pain. Another drop falls onto Chet's face is now also burning and a large patch on his arm is black, until Bobby decapitates Chet once more. Bobby rushes upstairs to find the cause of the acidic effect on Chet, to find Jody Mills, who had been scrubbing the floor and knocked over a bucket containing borax in the cleaning solution. With this information, Bobby places a call to Dean and informs him to use anything with sodium borate -- any soaps or laundry powder with "borax" on the label.

Dean has Sheriff Osborne locate cleaning supplies with borax. In a fight with Leviathan!Sam, Sheriff Osborne throws a bucket of borax onto the Leviathan, allowing Dean to decapitate it with a fire ax. Dean and the sheriff then rush to the interrogation room, where Leviathan!Dean is preparing to eat Sam, when Dean bursts into the room, flings liquid at the Leviathan and cuts off his head with the ax.