When a shower drain runs sluggishly without being fully blocked, you can restore full flow by removing the drain cover and clearing out accumulated hair and soap scum using a plastic drain-cleaning snake or wire tool. Afterward, flush the pipe with hot tap water or use a rubber plunger to dislodge clinging organic residue along the inner walls of the P-trap. Verification: Run the shower at full blast for one minute to ensure wastewater drains instantly without backing up.
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