To clear a completely blocked kitchen sink with standing water, start by bailing out excess water with a cup, then place a cup plunger firmly over the drain. If you have a double-basin sink, tightly seal the second drain opening with a wet washcloth to maintain airtight suction. Pump the plunger vigorously 10 to 15 times to force the grease clog through the P-trap. If plunging fails, place a bucket underneath the U-bend trap, unscrew the slip-joint nuts, and manually clean out the accumulated food sludge. Verification: Reassemble the plumbing and run hot water to verify rapid drainage.
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