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Demon Eye Wash is a form of eye drops that is used to cure one from being able to see demons.
Mephisto Pheles reveals the eye wash to Rin Okumura, seemingly knowing all about Godaiin's plight and of Rin's determination to find a way to help him. He offers it to Rin, but on the condition that he will not receive it until after completing an assignment.
- ↑ Ao no Exorcist Manga: Chapter 39, Page 35