How do I unclog a sink or tub drain myself?

Evidence grade: B1 — Trade practice

The trade ladder for a stopped drain is: plunger → P-trap cleanout → hand snake into the wall line. It resolves the large majority of clogs. Skip the folk remedies — baking soda and vinegar is theater against a real clog, not chemistry (see Repair Lab O04).

Effort: Easy to moderate · under 1 hr · plunger, hand snake, bucket, slip-joint pliers, rubber gloves

Before you start — ⚠️ one rule

If anyone has poured chemical drain cleaner into the sink, STOP. Do not plunge and do not snake it — the chemicals can splash and cause serious burns. Wait for the water to drain or call a plumber who is equipped for it [1].

Step 1: Plunge

1. Fill the sink with 3–4 inches of water so the plunger's cup seals; in a double sink, hold a wet rag tightly over the other drain.
2. Roll the plunger head into the water so you drive water, not air, into the drain, then pump vigorously for about 20 seconds. On your last upstroke, pop the plunger off the drain for extra pressure.
3. If the water does not swirl down, keep going for several minutes — plunging can take a while. Keep towels handy [1].

Disposer check first: if the clogged side has a garbage disposer that only hums, it is jammed, not clogged — switch it off, and free the blades by turning them manually with an Allen wrench through the hole in the bottom of the unit [1].

Step 2: Clean the P-trap

Most sink clogs sit in the P-trap or trap arm, where grease and coffee grounds settle [1]:

1. Sponge the water out of the sink, place a bucket under the trap — it will be full of dirty water.
2. Loosen the slip nuts (usually with slip-joint pliers; go gently to avoid cracking) and wiggle the trap free.
3. Dump it, scrub it out, and inspect the trap and trap arm for cracks or thin walls — replace worn parts now, while they are in your hands.
4. Reassemble hand-tight, then a quarter turn with pliers. Run warm water and check for drips — a paper towel laid under the joint shows slow leaks.

Step 3: Snake the wall line

If the trap is clean, the clog is in the drain line behind the wall:

1. Pull 6–10 inches of snake cable from the tip, tighten the setscrew, and feed it into the drain stub-out while cranking clockwise.
2. Resistance at first is usually just a corner — keep feeding. When the tip bites the clog, the tension in the cable drops; work it through, then crank counterclockwise and pull the cable back, cleaning the gunk off with a rag as you go.
3. Repeat until the cable runs free, reassemble the trap, and flush the line with warm water [1].

Tub drains: check the stopper first

Tub clogs are very often hair matted around the stopper mechanism, within reach of your fingers. Lift or unscrew the stopper and pull the hair out before you touch a plunger — most of the time that is the whole job. If the water still will not move, the same plunger → trap-access → snake ladder applies.

Stop rules — call a plumber NOW if

• Multiple fixtures are backing up at once (sink + tub, or flushing the toilet gurgles the sink). That is a branch or main-line blockage beyond a hand snake's reach.
• The trap or pipe crumbles when you touch it. Corroded metal traps and brittle old plastic break without warning; if slip nuts will not budge with reasonable force, stop before you crack the assembly.
• The snake hits something hard and will not advance or retract. Do not force cable into a line you cannot see into.
• You smell sewer gas strongly during the work and it does not clear — that can mean a dry or damaged trap elsewhere in the line [1].

PPE and ventilation

Rubber gloves and eye protection (splashes from drain water and snake cable). If chemical drain cleaner was used earlier: chemical-rated gloves and goggles, and do not proceed — hand it to a plumber. Ordinary room ventilation is fine; no special ventilation is needed.

Honest limits

• This guide follows the kitchen-sink sequence of its source [1]; the ladder is the same for bathroom sinks and tubs, but trap access under a tub is harder — many tub traps are not reachable without opening the wall, in which case a plumber is the honest answer.
• Prevention is worth more than the cure: never dump grease or coffee grounds down the drain, and run plenty of cold water through a disposer while it works [1].

Sources

1. Family Handyman (via The Free Library) — "How to clear clogged drains: with two simple tools — a plunger and a snake — you can clear 95 percent of your stopped-up drain problems" — https://www.thefreelibrary.com/How+to+clear+clogged+drains%3A+with+two+simple+tools--a+plunger+and+a...-a0111015260

Repair Lab · Release 1 · Evidence last checked September 30, 2026 · A project of AOJEL