How To Unclog Defrost Drain Free (2026)

To unclog a defrost drain, first locate the drain hole—typically found on the back wall of the refrigerator or freezer compartment—and then flush it with a mixture of warm water and baking soda. If the blockage is solid ice, use a hairdryer or a basting syringe filled with hot (not boiling) water to melt the obstruction.