Nothin' smells like OLD PRAWN SHELLS
A neighbour of mine used to gather up all the fallen rotten old oranges from under her trees and throw them over my fence. I asked her to refrain, but of course she blamed the kids.
So one dark night I gathered up 2 kg of prawn bodies from our last night's party, and, dressed in dark clothing, very gently removed a hub-cap from her car, emptied the prawns in and quietly put the hub cap back.
I don't think she ever found the source of that terrible smell, or maybe she did, 'cos the oranges stopped coming.