Although oil looks like a harmless liquid when hot, it **solidifies as it cools**, especially inside your cold plumbing pipes. Over time, that oil builds up, traps food particles, and leads to serious clogs that can damage your plumbing system.
Even worse, when it reaches public sewer systems, it contributes to **“fatbergs”** — massive, solid lumps of fat, oil, grease, and waste that cause costly blockages in city sewer systems.
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