First of all, you'll need to remove all the food items and throw away those that are getting old. Take out all removable parts (shelves, drawers, and bins).

Pour a box of baking soda in a bucket of warm water. Then use a clean cloth diped in this mixture, and start wiping the inside of the fridge (don't forget the inside of the door). When all is done, dry it out with a clean dry cloth.

Repeat the same procedure for all the pieces and parts you removed from the fridge, and then replace them back into the fridge. You can place a piece of paper towel in the drawers, to keep them clean for longer.

When this is done, you may now wipe off all the jars, with a damp cloth, as you place them back into the fridge.

Your fridge is now clean and odour free.