Bleach is a chemical product used for whitening or disinfecting, typically containing sodium hypochlorite or hydrogen peroxide.
In popular culture, Bleach refers to:
1. A Japanese manga series written and illustrated by Tite Kubo
2. The process of lightening hair color
3. Slang for removing color or vitality from something
Fun fact: The manga was named Bleach because the author wanted to convey the idea of "bleaching souls" to purify them.