(NOT speaking from experience)
Ideally, you'd want to use an alcohol to kill the existing growies, but you're still stuck with a residue.
Normally, you'd use chlorine (aka bleach) to clear it up, but that's definitely not a good idea, because of the other components involved.
Sorry, I just can't think of anything. If you were able to isolate the metallic components, bleach would take care of it. Otherwise, I keep thinking about a solution with some solids in it, but that would be a no no as well.
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