Around the House · Plumbing

How to unclog a drain

Before you pour a bottle of caustic chemicals down a drain that's already struggling — let's talk about what's actually clogging it and the cheaper, safer way to clear it. Most clogs are physical. Treat them physically.

Job time 10 min – 1 hr

Skill level Beginner

Job cost $0 – $30

The Honest Read

What this job actually involves

Almost every kitchen and bathroom clog is one of three things: hair (bathroom), grease and food (kitchen), or something a kid put down there (any drain, any time). None of those dissolve in chemical drain cleaner the way the bottle implies.

Drain chemicals work by generating heat to melt buildup. They also corrode old pipes, eat seals, and sit on top of the clog if the drain is fully blocked — which means a plumber now has to deal with caustic water on top of the original problem. Skip them.

Start with a physical fix: plunger, hair-snake, or P-trap removal. Works 90% of the time and costs almost nothing.

What you need

Tools & materials

Shop the supply side here. The big-ticket stuff and the brand-restricted items, we'll point you local further down.

Tools

Cup plunger (kitchen/sink) or flange plunger (toilet)
Hair-snake tool (the cheap plastic "Zip-It" style)
Channel-lock pliers
Bucket and rags
Flashlight
Drain auger / hand snake (25 ft) — for tougher clogs

Materials

Replacement P-trap washers (in case you have to take it apart)
Drain strainers / hair catchers
Dish soap and hot (not boiling) water
Baking soda and white vinegar (maintenance, not emergency)

The Steps

How to clear it

Identify the clog location

Is it one fixture or multiple? One sink = local clog in the P-trap or branch line. Multiple fixtures backing up = main line clog — stop and call a plumber before sewage backs up into the lowest fixture.

Try the hair-snake first (bathrooms)

The cheap plastic barbed strip. Push it down the drain, pull it out. If hair comes up with it, you've found your clog. Run hot water. Repeat until it pulls up clean. This solves 90% of bathroom drains in under five minutes.

Try the plunger (kitchen)

Block the second drain if you have a double sink (wet rag in the other side). Run an inch of water to seal the plunger. Sharp downward push, then up — that's the motion that breaks clogs. Twenty seconds of work, not twenty minutes.

Remove the P-trap

Bucket under the curved pipe below the sink. Unscrew both slip nuts by hand or with channel-locks (gently — they're usually plastic). Pull the trap off. The clog is almost always right there. Clean it out, check the washers, reassemble.

Snake the line if needed

If the trap is clear but water still won't drain, the clog is further down the branch line. Feed a 25-ft hand auger into the drain stub, crank slowly, and pull back. Most branch clogs are within 10–15 feet of the fixture.

Test and maintain

Run hot water for two full minutes. If it drains fast, you're done. Install a hair catcher to prevent the next one. Once a month, pour a kettle of hot water down the drain — that alone prevents most kitchen clogs.

Try local first · We'll wait

Why the drain aisle at a real hardware store beats the internet

When you have standing water in the sink right now, you're not shopping — you're problem-solving. Local stores stock the tools and the advice that make this a 15-minute job.

Drain augers in multiple lengths — see them, feel the cable, pick the right one for your job
Hair-snake tools (the $3 fix nobody buys until they need one)
Specialty drain bladders, expanding plugs, and the "what is this even called" parts that don't search well online
Replacement P-trap kits in the right size — bring the old one in
Real expert advice from someone who's heard your exact problem a thousand times

Find a local hardware store →

When to call a pro

Call a plumber if: multiple fixtures are backing up at once (main line clog); you see sewage backing up into a tub or floor drain; you've snaked the line and it's still slow; the drain serves a basement bathroom with an ejector pump that's not running; or you've already used chemical drain cleaner and the clog isn't moving. Don't snake on top of chemicals — let the plumber know what's in there.

Keep going

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