How to Unclog a Drain - step by step process guide

How to Unclog a Drain

6 steps 30 min Beginner From $7.53

Most drains clog from hair, soap, or grease. Mechanical clearing (snake or plunger) works better than chemicals — Drano often makes the problem worse and damages pipes. This walks through tools by clog severity, the right technique, and prevention.

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Step-by-Step Instructions

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Step 1: Try a plunger first (sink or shower)

Flat-bottom plunger works on sinks; flange (lipped) plunger is for toilets. Cover the overflow hole on a sink with a wet rag — otherwise pressure escapes there. Fill basin with 1-2 inches water to create a seal.

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Korky Beehive Max plunger (universal)

Works on sinks AND toilets. Heavy-duty rubber, doesn't collapse. ~$15-20.

$18 one-time View Details
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Cup plunger for sinks

Flat-cup style. Doesn't fit toilets. ~$8-12.

$10 one-time View Details
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Cover the overflow before plunging

Most sinks have a small overflow hole near the rim. Pressure escapes there if uncovered. Hold a wet rag over it.

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Step 2: Snake the drain (for deeper clogs)

A drain snake reaches several feet into pipes. Hand-crank versions for bathroom drains; powered versions (drill-driven) for kitchen and longer runs.

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Cobra Tools 25-foot drum auger

Hand-crank drum auger. 25 feet — reaches most clogs. ~$30-40.

$35 one-time View Details
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RIDGID Power Spin+ (drill-driven)

Mid-tier drum auger that attaches to a cordless drill. ~$50-70.

$60 one-time View Details
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FlexiSnake Drain Weasel (disposable)

Small plastic snake for hair clogs in bathroom drains. Single-use. ~$8 for 5.

$1.60/use $8 for 5 View Details
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Step 3: Use a drain bladder (toilet or long pipe)

A drain bladder attaches to a hose, expands inside the pipe, and blasts water through. Works on toilets and long runs that a snake can't reach.

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GT Water Products Drain King

Inflates inside the pipe, blasts water. Works on 1.5"-3" pipes. ~$15-20.

$18 one-time View Details
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Cobra ToiLet Auger 3-ft (toilet-specific)

Bent rubber cover protects the porcelain bowl from scratches. ~$28-35.

$30 one-time View Details
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Step 4: Avoid chemical drain cleaners (unless last resort)

Drano and Liquid-Plumr work by generating heat in the pipe — can damage PVC, corrode old steel pipes, and create dangerous reactions if mixed. Enzyme cleaners are gentler and slower.

Warning: Never use chemical drain cleaner after another chemical (or pour vinegar in). Hot mixtures can erupt and burn skin/eyes. If a chemical cleaner doesn't work, do NOT add a different one.

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BioClean enzymatic drain cleaner (preferred)

Live bacteria eat organic clog material. Slow (overnight) but safe for pipes. ~$25-32 for a year's supply.

$0.93/use $28 for 30 View Details
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Drano Max Gel Clog Remover (last resort)

If everything else fails. Wear gloves and eye protection. Never combine with any other cleaner. ~$8-12.

$10 View Details
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Step 5: Clean the trap (under-sink P-trap)

If a sink is still slow, the P-trap (curved pipe under the sink) often has accumulated gunk. Place a bucket under, unscrew both slip nuts, pull the trap, clean with a bottle brush, reassemble.

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Unscrew the P-trap slip nuts (no tools needed)

Plastic slip nuts hand-loosen. Metal traps may need channel-locks but gently — they're soft brass.

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Bottle brush to clean inside the trap

Long thin brush reaches inside. Soap and hot water. ~$5.

$5 View Details
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Replace the trap if cracked

PVC traps cost $5 at Home Depot. If yours is cracked or corroded, replace.

$8 one-time View Details
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Step 6: Prevent future clogs

Hair catcher in showers, monthly enzyme treatment in kitchen, never pour grease down the drain. These three habits stop 90% of recurring clogs.

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Hair catcher (Tubshroom)

Sits inside the drain. Catches hair before it goes down. Empty weekly. ~$13.

$13 one-time View Details
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Monthly enzyme treatment

Pour 1 oz BioClean down each drain monthly. Bacteria eat residue before it builds. ~$28 per year.

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Pour grease in a can (not the drain)

Cooking grease + cold water = solid plug. Pour grease in a coffee can, freeze, toss in trash.

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