How to Unclog a Bathroom Sink or Shower Drain

Drains clog because hair, soap scum, and mineral buildup accumulate in the trap and pipe. A slow drain is your warning sign; a fully backed-up sink means you're past the point of prevention. The good news is that bathroom drain clogs almost never require a plumber. The clog sits in the first few feet of pipe, right where your tools can reach it. What separates a quick fix from an hour of frustration is knowing which tool works for which type of clog and when to stop fighting and call for help. Your goal here is to restore flow without damaging the p-trap or the pipes themselves. Aggressive chemical drain cleaners work, but they're a last resort—they're harsh on older plumbing and can eat through certain plastic traps. You'll start with mechanical removal because it's safer, faster, and leaves no chemical residue. If you're dealing with a shower, the job is slightly different because the drain sits lower and the clog is usually hair-heavy. Sink clogs are often soap and mineral buildup. Knowing the difference helps you choose the right first move.

1. Clear the Work Zone First. If water is standing in the basin, remove it with a cup or wet/dry shop vacuum. This gives you access to the drain opening and tells you whether the clog is right at the surface or deeper in the pipe. For shower drains, unscrew the strainer cover. For sinks, clear away any debris by hand—hair wraps, toothpaste caps, whatever is loose.
2. Plunge With Purpose. Fill the sink or tub with 4–6 inches of water to create a seal. Place a cup-style plunger directly over the drain opening, push down firmly, and pull up sharply. Repeat 15–20 times in rapid succession. You're creating suction and pressure to dislodge the clog. Remove the plunger and check if water drains. If it does, run hot water for 30 seconds to flush debris further down.
3. Break Through With the Snake. If the plunger doesn't work, feed a 25-foot manual drain snake (auger) down the drain opening. Crank the handle slowly and feed the cable down until you feel resistance—that's the clog. Work the snake back and forth and rotate it; don't just push harder. You're breaking up the blockage, not punching through it. Once you feel give, pull the snake out and flush with hot water.
4. Fizz Away the Buildup. Pour 1/2 cup of baking soda directly down the drain, followed immediately by 1 cup of white vinegar. The mixture will fizz and bubble for 10–15 minutes. Cover the drain opening with a wet rag to keep the reaction contained. Let it sit for 1–2 hours, then flush with boiling water. This works well on soap scum and mineral buildup but is less effective on hair clogs.
5. Extract the Trap. Place a bucket under the p-trap (the curved pipe under the sink). Using an adjustable wrench, loosen the slip nuts on both ends of the trap. Remove the trap and empty its contents into the bucket. If it's full of hair and sludge, that's your clog. Use a wire brush or old toothbrush to scrub the inside of the trap, then reinstall it hand-tight, then snug with the wrench. Do not over-tighten—hand-tight plus a quarter turn is all you need.
6. Know When to Call. If the drain clogs again within a week, the blockage is deeper in the main line, not in your bathroom. This is the point to stop and consider a professional plumber with a motorized snake or camera line. Repeated clogs in the same drain usually mean tree roots, collapsed pipe, or grease accumulation in the main sewage line—problems that DIY tools can't fix safely.
7. Confirm Complete Flow. Run hot water for 30 seconds to a full minute. Watch the water level in the sink or tub—it should drop steadily without pooling. If it drains quickly and completely, the clog is clear. If water still pools, repeat the plunging or snaking. Once the drain is flowing, run hot water again to flush any remaining debris down the line.