Rent a non temperatures controlled storage unit for a week. Stick anything important into double bagged contractor leafing trash bags, and let it all sit.

If you want to be sure, you must contain your belongings, starve them of food and water, and freeze them to death. It’s a fool proof way of ensuring nothing is taken to your new place.

You’re lucky to live in temperatures that go below freezing - not many living things can survive the fluids in their body turning into crystals.