I've run into this issue in years past and always just baked the substrate/decor that was an issue. Just spread the chips out on large baking sheets at 250 for about an hour. Let them cool and put them in the enclosure. It's cheaper and doesn't involve chemicals of any kind. This also works for any driftwood you may find and want to use though make sure that larger pieces cook longer to ensure the interior part of the wood gets nice and hot as well.
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