Keep a box full of baking soda in your fridge. Make sure you open the packet a bit. Drop 2-3 drops of vanilla essence on a cotton plug and keep it near the air fan of the refrigerator. Do not keep anything open in the refrigerator. Clean you fridge with some water mixed with some lemon juice. It will make the odour dissapear.
About 3-4 tbsp vinegar in a bowl..add half a lemon. Keep it in the fridge.. or anywhere there's a foul smell. . Works everytime.
To biginwith switch of your main to. The fridge Remove each and every item. Wash the entire fridge with vinegar and liquid soap. ., including the rubber washer using a cotton bud . Then dry out properly . give the connection and set the right temp. Leave it for some time you can cut some lime rindes or cardamum powder in a small cup. Always put the cut veg and fruits in ziploc. Dont store onion and garlic. Make it a point to refresh your fridge once in fortnight. And try clear off left overs as soon as possible