How to defrost an old freezer?

My dad got an old fridge/freezer from work, because they got a new one. We took it because our old refridgerator alone didn't have enough space to help feed a family of 5. The problem arose when, well, the freezer seemed to shrink from the massive amount of ice and frost in the freezer. It was further pushed... show more My dad got an old fridge/freezer from work, because they got a new one. We took it because our old refridgerator alone didn't have enough space to help feed a family of 5. The problem arose when, well, the freezer seemed to shrink from the massive amount of ice and frost in the freezer. It was further pushed along when on "Seinfeld", one character was asked when he was going to defrost his freezer (The series was from the early ninties), and I have wondered since how to efficiently defrost an old freezer. Thanks!
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