A bathroom sink that drains slowly is one of the most common household plumbing complaints, and the cause is often less dramatic than people think. In most cases, the bottleneck is a buildup inside the drain line or in the trap area, where debris collects over time.
Plumbers typically see a few repeat offenders. The good news: with basic inspection and targeted cleaning, many slow drains can be restored without major repairs.
Hair and soap scum: the most frequent cause
Long strands of hair, fibers from bath products, and fine debris tend to catch and accumulate near bends and in the P-trap—the curved section of pipe under the sink. When mixed with soap residue, they form a sticky mass that reduces flow and eventually slows draining significantly.
If you notice water draining more slowly after hair-heavy showers or shaving routines, this is a strong indicator. You may also see gunk i ... Read more »





