A sink that drains sluggishly is usually restricted by an accumulation of hair, soap scum, body oils, and organic residue lining the interior walls of the P-trap pipe. Over time, these materials intertwine to form a restrictive sludge layer that narrows the internal diameter of the pipe, impeding water velocity and causing wastewater to pool in the basin rather than exiting freely. Verification: Remove the drain stopper and inspect the upper pipe opening for visible trapped hair and slime.
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