Rather than putting them in to soak overnight I would just wash them on hot, start it before you go to bed then using the hot water shouldn't be an issue. I've also read not to use plant-based detergent so depending on what your eco friendly detergent is that might be an issue. And how much detergent do you use? I wash with Sun free. It's cheap and it works, I use a half a cap full.
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Katie - loving wife, married 1/08
mama to Claire, born 9/10
Expecting baby Alice