Turn off the refrigerator and unplug it.
Remove all the items from your fridge. As you go, discard any expired food that is developing into a science project.
Place any food you choose to keep in a cooler while you work. Add ice if it will be out for some time for better preservation.
Clean the drip tray. This is located beneath the refrigerator. Be careful because it likely contains dirty water. Remove the grill from beneath the doors, carefully pull it out and dump the contents.
Use oats as an odor-absorber. Leave a bowl of oats out in your fridge and this will suck in the bad smells.