Pour ½ cup of baking soda into the drain. Use a spoon or brush to push it past the drain opening.
Immediately pour 1 cup of white vinegar into the drain. A vigorous fizzing reaction will begin.
Quickly cover the drain opening with a stopper or damp cloth to force the reaction downward into the pipe, not upward. Leave for 5–15 minutes (longer for tougher buildup).
Pour a kettle of boiling water directly down the drain to soften and loosen surface grease.
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