Pretty sure it's not possible. I think it actually chemically reacts, which is what neutralizes the smell. So in order to "clean" it you would need to chemical re-activate it. I think that would be more work then it is worth.

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The statements I make and pictures I provide are all fictional and at times found on the internet to provide others with growing information. The information I provide is for the personal use grower only. I do not support cultivation for the illegal sale of cannabis.