To clear a blocked double kitchen sink, you must account for the interconnected piping beneath the basins. First, bail out any standing water with a cup, and tightly seal one of the sink drain openings with a wet washcloth to maintain airtight pneumatic pressure. Place a cup plunger firmly over the opposite open drain, and plunge vigorously 10 to 15 times to force the grease clog through the central sanitary tee and P-trap. Verification: Remove the washcloth and run warm water down both sink basins simultaneously to confirm rapid, balanced drainage.
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