How to Unclog a Bathtub Drain
Updated February 25, 2026
Clear a clogged bathtub drain using a drain snake, plunger, or manual hair removal -- without chemical cleaners that damage pipes and tub finishes.
Overview
Bathtub drains clog from hair. That is it for 90% of cases. Hair wraps around the drain crossbar and stopper mechanism, creating a mat that traps soap scum and slows flow until the tub fills faster than it drains. The fix progression: remove visible hair from the drain opening first (free, 2 minutes), then plunge (5 minutes), then snake (15-30 minutes). Chemical drain cleaners are the wrong tool -- they sit in standing water on the tub surface, damage the finish, corrode older pipes, and create a hazardous splash if you plunge afterward.
What You'll Need
Safety First
- Never use chemical drain cleaners in a bathtub. The chemicals sit on the tub surface in standing water and damage acrylic, fiberglass, and porcelain enamel finishes. They also corrode older metal pipes.
- If someone already poured chemical cleaner into the drain, do NOT plunge. The splash can cause chemical burns to skin and eyes. Let the chemical drain completely first (may take hours), then flush with water before plunging.
- Wear rubber gloves. Bathtub drain clogs are a wet mat of hair, soap scum, and bacteria.
Step-by-Step Instructions
- Remove the Drain Cover and Visible Hair
Remove the drain cover or stopper. Trip-lever stoppers: pull the stopper straight up (it lifts out with a rocker arm attached). Push-pull stoppers: turn counterclockwise and lift. Toe-touch stoppers: unscrew counterclockwise. Pop-up stoppers: pull straight up and wiggle. With the stopper out, use needle-nose pliers or a Zip-It tool ($3) to pull hair from the drain opening and the crossbar below. You will likely pull out a disgusting wad of hair and soap -- that is the clog.
Tip: A Zip-It drain cleaning tool ($3) is a thin plastic strip with barbs that grabs hair. Insert, push down 12-18 inches, pull up. The barbs catch hair and drag it out. Disposable, effective, and handles most bathtub clogs on its own. - Plunge the Drain
If removing visible hair does not restore flow, plunge. Fill the tub with 2-3 inches of water. Plug the overflow plate opening (the round plate above the drain on the tub wall) with a wet rag -- this prevents air from escaping and directs all plunger force downward. Place a flat-bottom cup plunger over the drain. Push down firmly, pull up sharply. 15-20 strokes. Remove the plunger -- water should drain. If it drains slowly, plunge another cycle.
Tip: The overflow plate bypass is the key to effective bathtub plunging. Without plugging it, the plunger pushes air up through the overflow instead of down through the clog. A wet rag stuffed into the overflow opening is all you need. - Snake the Drain
Plunging did not clear it? The clog is deeper in the P-trap or branch drain. Remove the overflow plate (two screws). Pull out the trip-lever linkage (if your tub has one). Insert a 15-25 foot drain snake through the overflow opening -- this gives a straighter path to the P-trap than going through the drain opening. Feed the snake until you hit resistance, crank through, pull back slowly. The snake brings the clog material out. Reassemble the overflow plate and linkage.
Tip: Going through the overflow opening instead of the drain is the pro technique. The overflow connects directly to the drain pipe and bypasses the tight curves of the drain assembly. The snake feeds much more easily. - Flush and Test
Run hot water for 3-5 minutes to flush loosened debris through the drain line. Watch the drain speed -- water should exit as fast as it enters. If it is still slightly slow, repeat the snake. Pour a kettle of boiling water followed by dish soap to dissolve residual soap scum in the pipe. Test by filling the tub 4-5 inches and releasing the drain -- it should empty in under 60 seconds.
Tip: After clearing the clog, install a drain hair catcher ($3-$8) over the drain opening. It catches hair before it enters the drain and is the single best prevention measure. Clean it after each shower.
Pro Tips
- A drain hair catcher ($3-$8) prevents 90% of bathtub drain clogs. TubShroom ($10-$13) fits inside the drain opening and catches hair in a cylinder you clean weekly. Best $10 you can spend on bathroom maintenance.
- Trip-lever stopper linkages collect hair where the linkage sits inside the overflow pipe. When you remove the overflow plate for snaking, pull the linkage out and clean it. This hidden hair ball is often the actual clog, not the drain opening.
- Enzyme drain cleaners (Bio-Clean, Green Gobbler) are safe monthly maintenance for bathtub drains. They use bacteria to eat organic buildup without damaging pipes or finishes. Not a fast fix for an active clog, but excellent for prevention.
- If the tub drain clogs every 2-3 months despite a hair catcher, the branch drain pipe may have interior buildup (common in older homes with cast iron or galvanized pipes). A plumber can hydro-jet the line ($200-$400) to clear accumulated buildup.
- Standing water in a clogged tub breeds bacteria quickly. Do not let a clogged tub sit for days -- the standing water develops a biofilm and odor. Clear the clog or bail the water out.
When to Call a Pro
Call a plumber if the snake cannot reach the clog (blockage is deep in the branch drain or main line), if multiple fixtures back up simultaneously (main line issue), if the tub drain is old cast iron with heavy internal corrosion (may need pipe replacement), or if you hear gurgling from other fixtures when the tub drains (vent problem).
Frequently Asked Questions
When should I call a plumber to unclog a bathtub drain?
Call a plumber if the snake cannot reach the clog (blockage is deep in the branch drain or main line), if multiple fixtures back up simultaneously (main line issue), if the tub drain is old cast iron with heavy internal corrosion (may need pipe replacement), or if you hear gurgling from other fixtures when the tub drains (vent problem).
What are some expert tips to unclog a bathtub drain?
A drain hair catcher ($3-$8) prevents 90% of bathtub drain clogs. TubShroom ($10-$13) fits inside the drain opening and catches hair in a cylinder you clean weekly. Best $10 you can spend on bathroom maintenance. Trip-lever stopper linkages collect hair where the linkage sits inside the overflow pipe. When you remove the overflow plate for snaking, pull the linkage out and clean it. This hidden hair ball is often the actual clog, not the drain opening. Enzyme drain cleaners (Bio-Clean, Green Gobbler) are safe monthly maintenance for bathtub drains. They use bacteria to eat organic buildup without damaging pipes or finishes. Not a fast fix for an active clog, but excellent for prevention. If the tub drain clogs every 2-3 months despite a hair catcher, the branch drain pipe may have interior buildup (common in older homes with cast iron or galvanized pipes). A plumber can hydro-jet the line ($200-$400) to clear accumulated buildup. Standing water in a clogged tub breeds bacteria quickly. Do not let a clogged tub sit for days -- the standing water develops a biofilm and odor. Clear the clog or bail the water out.
What tools do I need to unclog a bathtub drain?
You will need: Zip-It drain cleaning tool ($3) or needle-nose pliers, Flat-bottom cup plunger ($5-$10), Drain snake, 15-25 foot ($15-$25), Screwdriver (for removing the overflow plate), Rubber gloves, Wet rag (to plug the overflow during plunging).
When should I call a professional instead of doing this myself?
Call a plumber if the snake cannot reach the clog (blockage is deep in the branch drain or main line), if multiple fixtures back up simultaneously (main line issue), if the tub drain is old cast iron with heavy internal corrosion (may need pipe replacement), or if you hear gurgling from other fixtures when the tub drains (vent problem).
How difficult is this project?
This project is rated easy. Most homeowners with basic tools can complete it.
How long does this take?
Plan for approximately 15 - 45 minutes. First-timers may need extra time.
How much will this cost?
The estimated cost is $0 - $25. Costs vary by location and materials chosen.