I have 2 things to recommend. First, if there is a filter for the
water (there should be) to change it. If the water line does not
have a filter, add it.
The second recommendation is to get a small back of the cheap bbq
charcoal brickettes. Not the easy start, but plain charcoal. This
stuff is even more effective than baking soda at keeping odors
down. I have 3 in the fridge and 3 in the freezer, in the door part
in a disposable plastic cup. I have 4 in a margarine bowl in the
chest freezer.
The charcoal is also wonderful to place in shoes (insert in old
socks) to keep odors down, and to place in ice chests or thermoses to
prevent odors.
Ann in Arkansas