I have had very good luck using vanilla. Just wet a dish towel with water and wring out excess. Then pour vanilla straight from the bottle onto the rag until it is wet (but not dripping). Wipe the inside of the fridge with the rag. When done, reapply vanilla water to rag and leave in the fridge overnight. This was the way Rubbermaid suggested to get odors out of an ice chest. ... View related article.
