Refrigerant gaskets are the strips around the door that keep your fridge and freezer sealed shut, making them one of the most vital components to maintain.
You can test to see if they're working efficiently by shutting a dollar bill in the door. If you can pull it out easily, it may be time to replace the gaskets. To ensure they stay effective, wipe them down with all-purpose cleaner or vinegar to avoid the buildup of mildew.
Wipe gaskets down regularly or as needed.