Yes, Dawn dish soap can successfully help unclog minor grease, soap scum, and hair-and-oil sludge blockages in a bathtub drain. Because dish soap is formulated to cut through stubborn fats and oils, squirting a generous amount down the drain followed by a kettle of hot water lubricates the interior pipe walls and breaks down the organic binding agents holding minor debris together, allowing wastewater pressure to flush it away. Verification: Flush the drain with hot running water to confirm that the soapy residue and blockage have washed away completely.
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