Comment by gus_massa

Rehashing another of my comments: The smell is caused by https://en.wikipedia.org/wiki/Trimethylamine

From a random google search I got this report https://uvadoc.uva.es/bitstream/handle/10324/18877/TFG-I-468... (mostly in Spanish, with an English abstract). It looks serious and as far as I understand it makes sense.

One of the solutions in the report is to add iodine, so I guess bleach would work too. But I also guess the final product is more dangerous and may release other nasty fumes. Don't try it at home.

I think acid can prevent the smell to escape to the air, but I guess you need a high concentration to destroy it, perhaps add heat to make the destruction faster. Anyway, you have to neutralize the acid before releasing the leftovers, and the boiling acid nasty goo sounds dangerous. Don't try it at home.