Pouring liquid cooking oil, grease, or melted fat down a garbage disposal or kitchen sink is a severe plumbing mistake that should always be avoided. While oil enters the drain in liquid form, it cools and solidifies inside plumbing pipes, coating interior walls and trapping food particles to form stubborn blockages. Instead of using the disposal, collect used cooking oil in a disposable container, let it solidify, and discard it in the household trash to prevent costly clogs.
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