Clean it thoroughly first and we use fresh coffee grounds vs baking soda in the freezer or fridge. I replace the grounds every couple of days and it has worked on several occasions for us in the past. Once got a old fridge for the hunting camp, worked but the guy who owned it never cleaned I am sure. Stunk to high heaven, so bad I need to plug my nose when cleaning it out!! Once cleaned I left the door open in the backyard for a few days with BS, then rolled into the garage fired it up and put a couple bowls with fresh ground coffee with in a few days it smelled JL.

The newspaper trick works my mom and grandma swear by it for a freezer gone bad job. My dad on the other hand believes that once the smell of rot is in the freezer it's only purpose is the junk yard...really picky nose on the man!