Fridges and dishwashers have a snap-off grille in the front. Well, there's a lot of secret storage space under there. Ask yourself this: How many burglars will be thinking about cleaning your refrigerator coils? But before you stuff treasures under a fridge, take a peek to see where the coils are. On some models, a stack of cash might block the airflow. That will make the fridge work harder and could even damage it.