To clear a blocked double sink drain, start by bailing out excess standing water with a cup. Tightly seal one of the sink drain openings with a damp washcloth to maintain airtight pneumatic pressure, place a cup plunger firmly over the opposite open drain, and plunge vigorously 10 to 15 times. If plunging fails, place a bucket underneath the central P-trap, unscrew the slip-joint nuts, and manually clean out the accumulated food sludge from the shared sanitary tee and U-bend trap. Verification: Reassemble all piping and run warm water down both basins to verify smooth, balanced drainage.
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