When a bathtub drain runs sluggishly without being totally blocked, you should remove the drain stopper and clear out surface hair and soap scum using a plastic hair-removal tool. Afterward, pour a kettle of hot water mixed with liquid dish soap down the drain to melt and wash away congealed body oils and organic residue lining the interior walls of the P-trap pipe. Verification: Run the shower at full blast for one minute to ensure wastewater drains instantly without pooling.
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