L.,
I have used fresh coffee grounds to de-odorize a refrigerator in a rental unit we have that was unplugged and left with food in it, it was bad! I first cleaned it thououghly, scooped the coffee grounds into a bowl directly from the coffee can and put them in the fridge (I put several bowls in there at one time), plugged it in and left it for a couple of days. It did smell like coffee afterward, but that beats the smell of rotten food!
I have also read that if you put fresh cut grass on cookie sheets and put one on each shelf the chlyphorll in the grass will deodorize a fridge. I have never tried it, and its also the wrong time of year too. I have also read that bowls of vinegar will deodorize and also to completely fill the fridge/freezer with crumpled newspaper and leave it for a couple of days helps. Although I have not tried any of these other things, I thought I would mention them anyway. Good luck!