I'd first determine if the stink is from the gear or the container. Nine out of ten times, in my experience it's been the container -- usually cloth, leather, foam, etc. That's going to be more difficult to remove. I've never heard of STINKY-BE-GONE, but that or just activated charcoal or cedar chips might help/work -- but it might take a long time. Moths ball are good for killing mold, if you suspect that -- but in that case getting rid of the container is probably prudent. Some containers can be washed in one way or another -- with a scented cleanser. Another option to try is moth balls -- camphor.
If the stink is in the gear, I'd just leave it in a safe well-ventilated place -- out of the container -- for as long as needed. Stink doesn't stick to metal or glass very well.
Finally, whenever I get something that smells old/musty I do a thorough search for MOLD!!!!