Assuming you've removed the bulk of the corpse, wash out with detergent, then put a load of small, sharp, pebbles in, wash again shaking and stirring the pebbles around (little bits of fur etc. get stuck to the inside), repeat. Now add bleach (diluted) and leave for an hour or more, then thoroughly wash and rinse again, then boil several lots of water through it.
It will now be as clean as it left the factory - as to whether your wife will ever drink from it again is another matter