The only thing I've found to remove stink from Fridge or Freezer is Thaw and wash with bleach
If there is a bit more smell and you've aired it out
Put a small Open Mason jar 3/4 full of ammonia and close it for a day Repeat airing it out
Good Luck
Tommyt
I will say this if you keep Fish and Bait for years in one there is no help
the smell (and I hope not in your case) gets into the Plastic walls
If its an up-right you could always salvage it as a Smoker