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If you take a close look at the seal of your fridge door and notice that it doesn't quite seal so it's airtight, there are a few things you can do to make it work again rather than replacing the entire seal.
Grease and grime may have gathered in the seal’s folds, so clean it out with a cloth dipped in a solution of three parts warm water and one part white vinegar.
Cracks can appear in the seal if moisture levels in the rubber get too low. Rejuvenate old seals or just maintain them by applying a thin coat of petroleum jelly or mineral oil over the seal and wiping off the excess.
Gaps in the door seal can be fixed with a hairdryer: simply hold the dryer on a high setting over the affected area from a distance of 20 cm. Once the rubber warms up, it can be molded to cover the gap.
To bulk out a seal that has lost its shape, slide a thin cylinder of plastic (such as cling wrap rolled into a tube) into the gap behind the seal to help the seal sit flush against the metal part of the fridge.