Remove all the food in the refrigerator. Store it in sealed coolers while you defrost.
Lay old, clean bath towels in the bottom of the refrigerator and on the shelves to catch water as the ice buildup is melted.
Unplug the refrigerator and plug in the hair dryer. Set the dryer on "Medium" heat.
Aim the flow of hot air toward the top area of the ice buildup. Move the blow dryer in a back-and-forth sweeping motion to slowly melt the ice. Change towels as needed and continue to melt the buildup of frost.
Turn off the hair dryer and plug the refrigerator back in. Remove the wet towels from the refrigerator.
Wipe down the interior of the refrigerator with clean cloths to remove any moisture left on the surfaces. Restock the refrigerator with your food items.