Cleansed the fridge.
Had given it a thorough scrub, not long ago, but, somehow there was a foul smell in there, that did not disappear by the thorough cleaning.
Have now taken apart what I had not dared to take apart before, and have gotten everything rinsed with de-naturalised alcohol, and, when possible, rinsed with boiling water.
Smell seems gone now. There is now the scent of spiritus. No idea what the foul smell was. Nothing looked dirty and everything had been cleaned.