How to Unclog a Drain: Every Method, In Order
To unclog a drain, work from gentlest to most aggressive: clear the strainer and standing water, try a plunger, then hot water with dish soap, then baking soda and vinegar, then a hand snake, and finally pull the P-trap. Most kitchen, bathroom, shower, and tub clogs give way by the plunger or snake stage. Skip liquid chemical cleaners, and call a plumber the moment more than one drain backs up. Related: unclog a shower drain. Related: unclog a bathtub drain.
The methods in order (start at the top, stop when it clears)
These five methods run gentlest to most forceful. Each one is safe for common household pipes when used as described. Try them in sequence: once water drains freely, you are done, and there is no reason to keep going. If you get through the P-trap and the drain still stands, the blockage is deeper than a fixture drain and it is time to call a pro.
- Clear the strainer and bail the standing water. Pull the sink strainer, tub stopper, or shower cover and hook out any visible hair or gunk with a plastic zip tool or bent wire. Bail out most standing water so you can see what you are doing and so the next method is not diluted.
- Plunge it. Cover the drain with a cup plunger, seal any overflow opening with a wet rag, and add just enough water to submerge the plunger cup. Push and pull firmly 15 to 20 times, keeping the seal. Plunging moves a column of water against the clog, which shifts most soft blockages.
- Hot water and dish soap. Squirt a few tablespoons of grease-cutting dish soap into the drain, then pour in hot water. Use boiling water only for metal pipes, and hot tap water (about 120 to 140 degrees Fahrenheit) for PVC. The soap emulsifies grease so the water can carry it off. Best on kitchen drains and slow, greasy backups.
- Baking soda and vinegar. Pour about half a cup of baking soda down the drain, then half a cup of white vinegar, cover the opening, wait 10 to 15 minutes, and flush with hot water. The fizzing loosens film and light soap scum. It is maintenance, not muscle, so do not expect it to move a packed hairball.
- Run a hand snake. Feed a hand auger (drain snake) into the drain or overflow until you hit resistance, crank to bite into the clog, then either break it up or pull it back out. Flush with hot water and repeat if the drain is still slow. This is the fix for hair and solid clogs a plunger cannot move. See how to use a plumbing snake for the full technique.
- Remove the P-trap. Under a sink, put a bucket beneath the U-shaped trap, unscrew the two slip nuts by hand or with channel-lock pliers, and slide the trap off. Clear it out, check the trap arm going into the wall, reassemble, and run water to check the joints for leaks. This catches jewelry, food wads, and grease the snake missed.
Method comparison table
Each method suits a different kind of clog and carries a different caution, so match the tool to what is actually blocking the drain. Start with the gentlest option that fits, mind the pipe-safety notes, and watch the temperature limits on PVC, which softens near 140 degrees Fahrenheit while metal pipe handles boiling water.
| Method | Best for | Caution |
|---|---|---|
| Strainer clean-out and bailing | Visible hair, food, and gunk near the opening | Wear gloves; do not push debris further down |
| Plunger (cup) | Soft clogs in sinks, tubs, showers | Seal the overflow first or you lose all suction |
| Hot water and dish soap | Grease and slow, greasy kitchen drains | Boiling water on metal only; PVC tops out near 140 degrees Fahrenheit |
| Baking soda and vinegar | Light buildup and routine maintenance | Weak on solid clogs; not a substitute for a snake |
| Hand snake (auger) | Hair and packed clogs a plunger will not move | Feed slowly to avoid scratching finishes or kinking the cable |
| P-trap removal | Objects and grease lodged in the trap | Bucket underneath; re-check slip-nut joints for leaks |
A word on chemical drain cleaners
Skip the bottle of liquid drain cleaner in most cases. Caustic and acid cleaners generate heat as they react, which can soften or warp PVC, corrode older galvanized and cast-iron traps, and crack a toilet bowl. On a fully blocked drain they simply pool on top of the clog, doing little while releasing fumes into the room. If you have already poured chemicals in, tell any plumber who works on the drain, because that standing liquid is a burn hazard.
The mechanical methods above carry none of that risk. A plunger and a hand snake move or remove the clog physically, so they work whether the blockage is grease, hair, or a dropped object, and they will not damage the pipe you are trying to save.
How to unclog by drain type
The general order holds everywhere, but the fastest first move changes by fixture. Kitchen clogs are usually grease and food, bathroom and tub clogs are usually hair and soap, and each has a quirk (a disposal, an overflow, a pop-up stopper) worth knowing before you start.
Kitchen sink
Kitchen clogs are grease, coffee grounds, and food, so lead with hot water and dish soap, then plunge. If there is a garbage disposal, confirm it is not jammed and run it before blaming the drain. If two basins share a drain, seal the second basin’s strainer with a wet rag so your plunger keeps its suction. Grease that has hardened in the trap usually needs the P-trap pulled.
Bathroom sink
Bathroom sink clogs are hair bound up with toothpaste and soap, and they collect on the pop-up stopper. Lift or unscrew the pop-up (reach behind the drain pipe under the sink to release the pivot rod), pull the hair off it, and clean the stopper. That alone clears many bathroom sinks. Plunge or snake if water still stands after the stopper is clean.
Shower
Shower drains are almost always hair. Pop off the strainer cover, then use a plastic zip tool or a hand snake to hook and drag out the hair sitting just below the opening. A plunger works if you first smear petroleum jelly on the rim for a better seal. Flush with hot water. Repeat the snake pass if the water is still slow to drain.
Bathtub
Tubs clog with hair and soap scum, and they have an overflow you must seal. Remove the stopper (many lift and twist off, some need a screw removed), pull out the hair, then plunge with a wet rag jammed into the overflow plate so the plunger builds pressure. If plunging fails, feed a hand snake through the overflow opening rather than the drain, which is a straighter shot to the clog.
When to stop and call a pro
Stop DIY work and call a plumber when more than one fixture is affected, when you have run a hand snake and the P-trap and the drain still will not clear, or when water or sewage backs up out of another drain. Those are signs the blockage is in the main line, beyond what household tools reach, and pushing more water in only makes the backup worse.
- Several drains back up at once, or a toilet gurgles when the sink or tub drains. The clog is in the shared main line, not the fixture.
- Sewage smell or dark water comes up in a tub or floor drain. That points to a main-line or sewer problem, which is a health issue as much as a plumbing one.
- You cleared the trap and it is still blocked. The clog is past the fixture drain, in the branch or stack, where a longer powered machine is needed.
- The same drain clogs every few weeks. Repeat clogs often mean root intrusion or a bellied pipe that a camera inspection should diagnose.
For a main line or a stubborn branch clog, a pro reaches for a powered drain cleaning machine that runs far more cable with far more torque than any hand tool. Before you book, it helps to know what a drain clearing job costs so the quote holds no surprises. Many single-drain clogs are a flat, affordable visit; a main-line clearing or a camera inspection runs higher.
Frequently asked questions
Does baking soda and vinegar actually unclog a drain?
It works on light grease and soap buildup, not on a solid clog. The fizzing reaction loosens film on the pipe wall but produces almost no pressure, so it will not push through a hairball or a wad of food. Use it as maintenance or a first try, then move to a plunger or snake if the water still stands.
Are chemical drain cleaners safe for my pipes?
Often not. Liquid caustic and acid cleaners generate heat that can warp PVC, corrode older metal traps, and crack a toilet bowl. They also sit on top of a full blockage doing nothing while gassing off fumes. Most plumbers skip them entirely and reach for a plunger or snake first, which carry no pipe risk.
Can I pour boiling water down the drain?
Only into metal pipes. PVC is rated to about 140 degrees Fahrenheit and boiling water is 212, hot enough to soften the plastic or loosen a glued joint. If your drain lines are PVC, use hot tap water from the water heater instead, roughly 120 to 140 degrees, which is safe and still cuts grease.
Why are all my drains clogged at once?
When several fixtures back up together, or a toilet gurgles when the sink drains, the blockage is in the main line past your fixture traps, not in any one drain. Household plungers and hand snakes cannot reach it. Stop DIY attempts, avoid adding water, and call a plumber for a main-line clearing or camera inspection.
How do I unclog a drain with standing water that will not go down?
Bail out most of the standing water first so you have room to work, leaving just enough to cover a plunger cup. Plunge firmly 15 to 20 times with the overflow sealed. If it does not clear, the clog is packed too tight for suction and you need a hand snake fed directly into the pipe.
Last reviewed: August 2026.