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How to identify cold spots in your fridge
Gather a notebook and writing utensil.
The main problem with cold spots is that they're invisible, which makes them easy to forget. Having a notebook and writing utensil handy in the kitchen will give you the opportunity to make a log of freezing.
You might find it even easier to remember this if you use a magnetic pen/notepad. This way, when you look at the fridge, you'll be reminded about cold spots.