So sorry about the stink!
I would give the metal internals a careful (careful, staying awayyyyyy from the finish) with methylated alcohol. Q tip, no dripping, the alcohol will wreck the finish.
Any fabric, felt, etc that is stinky will remain so. I would replace those things.
One thing I have done with stinky machines once they were clean is put a drop of peppermint oil in their innards. Again stay awwwwayyyyy from the finish.
The rubber of the cords may also harbour a smell. Might need to wipe with alcohol or bleach (not great for rubber, but [robably won't kill it this once.... Or soapy water, of course not getting the wiring itself wet....) os who knows, maybe replace the wires if you are very handy!
The stinky case, those are a problem. A Big problem. Let us know how it goes.
Good luck, and again, I am sorry for the misfortune.
-C.