A few natural remedies To get rid of any bad odor and refresh the fridge:
Vanilla: Wipe the inside of the fridge with vanilla extract. Also, keep a small cotton ball soaked with vanilla extract inside the fridge to prevent odor.
Lemon: Spray some lemon juice and wipe with a cloth to not only clean the fridge but also to get rid of the odor.
Coffee: Place a bowl inside a fridge with fresh coffee grounds to suck the bad smell.
Baking Soda: Use baking soda to absorb the odor and keep the fridge smelling fresh.
Apple Cider Vinegar: Keep a open jar of apple cider vinegar in the back of the fridge to eliminate odor.