A dash of vinegar in the 'pit' at the back of the refrigerator helps against algae, causes the gutter to never overflow with water, and also goes against odors.
Refrigerator odors fight with a cup of cold coffee, one day leave in the fridge, then the smell away.
If the refrigerator odor spread, it is a good idea to put half a potato in a bowl of lemonade for overnight uncovered at the bottom of the refrigerator. This will absorb the odors.
To leave odors in the fridge disappear you can insert a dry tea bag. This absorbs the odors. A few times a month and change the bag off the dirty refrigerator odors! I've tried it and it really works!