I think hot water and a regular detergent should do it, hopefully! And I agree with PP that soaking in bleach can break down your diapers, but you probably aren't using enough to do much harm. I think adding a 1/4 cup to your wash will be more effective than soaking in 1 tbsp.
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Katie - loving wife, married 1/08
mama to Claire, born 9/10
Expecting baby Alice