Hair bleach does not stay active for very long once it has been mixed. It begins to lose strength quickly and should be used within an hour.
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This website is awesome it shows you items and how to make bleach solution. I tells you how much bleach to put in how much water. It also tells you how long to soak them and if you should rinse or just air dry. Have fun cleaning!!!!
http://www.clorox.com/our_story/article.php?subsection=understanding_bleach&article_id=tab