Okay again, Bleach has to do with the Bleaching or cleansing of souls. It's what is known as a metaphor. It's not meant to refer to the household cleaning product, but the actual verb:
Quote:
bleach (blch)
v. bleached, bleach·ing, bleach·es
v.tr.
1. To remove the color from, as by means of chemical agents or sunlight.
2. To make white or colorless.
v.intr.
To become white or colorless.
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Taken from Thefreedictionary.com