To fix a very slow draining sink, start by removing the drain stopper and using a plastic hair-removal tool to pull out trapped sludge from the upper P-trap. If surface clearing does not work, place a cup plunger over the drain, seal the overflow hole with a wet rag, and pump vigorously 6 to 8 times to dislodge the obstruction. Finally, pour a pot of hot water mixed with dish soap down the pipe to flush away lingering grease residue. Verification: Run the faucet at full volume to confirm that wastewater empties instantly without pooling.
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