Clean up any spills immediately with a damp, soapy cloth. Don't allow them to stay in the freezer because they could give off an odor.
Ensure that all packaged, frozen items are in airtight, sealed containers or packing to prevent odors from escaping. Wrap strong-smelling foods that you are preparing to freeze in several layers of heavy-duty aluminum foil or freezer paper before storing.
Place an open container of baking soda in an undisturbed area of the freezer to absorb odors. Replace the container with a fresh one approximately every 30 days.