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Scrub out everything on the inside with bicarb and water as a start, then see if you can poke the drain hole through with sticks, pipe cleaner, string, get some bleach down it etc. Clean out that drain tray as well. If it’s a fridge freezer, the drain passage might also be frozen lower down, so it won’t drain out. Might have to empty it out and defrost it for a day or so.
So, the smell keeps returning. It's clean inside and while there is some gunk round the back in the little hole outlet it doesn't smell. The smell returns whether the fridge is on or off.