Well, I wouldn't think it would be very effective. I mean, diacetyl is cleaned up by yeast, that's why the diacetyl rest is done in the primary, before racking. It CAN be done in secondary, but it would be very slow because of the amount of yeast removed. In the bottles, I wouldn't think the yeast would be very numerous. I guess it could happen, though, if you waiting long enough.
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