My apartment came with one of the small fridges that only has a metal compartment to hold frozen items. Only items near the metal bit actually stay frozen – if I cool the fridge enough for everything in the freezer bit to be frozen, everything else in the fridge will also freeze.
Due to high humidity, the freezer walls quickly get covered in an ever-thicker layer of ice. That reduces cooling effectiveness and also makes it difficult to get certain items in and out of the freezer.
I wanted a way to prevent the freezer from getting the huge layer of ice, and I found a possible answer: coat the insides of the freezer with vegetable oil.
I will have to try it next time I defrost the freezer…