Yo Matt ... long time.
I'd cut open a Pur water filter and dump the activated carbon from there in a small tupperware container that goes into the otterbox.
The activated charcoal in the Pur filter is cleaner and more absorbent than a briquette. After washing, oxidizing (below) & drying, put everything together with the carbon, close it up, and forget it for a month or two.
I'd avoid oxidizing agents other than good old sunlight or drugstore 3% hydrogen peroxide. Oxyclean is a stabilized powdered peroxide (sodium percarbonate) which is another option. Hypochlorite (bleach) I would avoid completely. A week in the sun would do wonders I think, if still stinky then I'd go drug store peroxide. Soak a day or two, rinse well, dry and close up the otterbox with active carbon inside.
OR ... you can just embrace the cherry.
