If you’ve noticed ice crystals on your frozen foods or condensation in your fridge, check your refrigerator seal. After some troubleshooting, you might be able to make a DIY repair without having to resort to a refrigerator gasket replacement.

First, open your refrigerator’s freezer door and slip a dollar bill against where the gasket seals to the freezer cabinet. Shut the door to hold the bill in place.

If the bill slips out, your seal isn’t tight.

Fortunately, moistening the seal with Vaseline (petroleum jelly) should do the trick and revive the strong rubber grip of your fridge’s youth AND keep your foods nice and chilly. Just apply a thin layer of Vaseline to the part of the seal that touches the refrigerator or freezer, and voila!