How effective is peroxide treatment in mushroom growing?

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I am currently able to grow grain or sawdust spawn consistently without contamination, the only exceptions being gross errors on my part (getting my finger in the container, or dropping a lid, etc.) or undetected spoiling of certain ingredients. With agar cultures, I get occasional mold colonies, usually only on older plates at the edges where the peroxide has largely disappeared. With bulk mushroom substrate, my success rate in preventing contamination currently runs around 99% when I follow the protocols set forth in Growing Mushrooms the Easy Way, although it was lower in the early days of my experimentation with peroxide because of my own inexperience with mushroom growing.
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