How to Unclog a Drain
Most household clogs are hair, soap scum, or grease sitting in the trap or the first few feet of pipe — usually clearable with a plunger or a drain snake, no chemicals required.
Updated July 2026 — written and reviewed by the HomeCostGuide editorial team
Steps
- 1
Remove standing water and visible debris
Bail out excess standing water and pull any visible hair or debris from the drain opening by hand or with a zip-it tool.
- 2
Try a plunger first
Cover any overflow opening with a wet rag, add a couple inches of water, and plunge firmly for 15–20 seconds.
- 3
Use a drain snake if plunging doesn't clear it
Feed the snake into the drain until you feel resistance, then rotate and pull to catch and remove the clog.
- 4
Check the P-trap
If the drain is still slow, place a bucket under the P-trap, unscrew the slip nuts, and clear any blockage inside before reassembling.
- 5
Flush with hot water
Run hot water for a minute or two to clear any remaining residue and confirm the drain flows freely.
Safety notes
- Avoid chemical drain cleaners before plunging or snaking — they can splash back and are harder to work around safely if you end up needing to open the trap.
- Never mix different drain chemicals; the combination can be hazardous.
When to call a pro
If multiple drains in the house are slow at the same time, that points to a main line clog, not a fixture-level one — that's a job for a plumber with a motorized drain auger.
Frequently asked questions
Are chemical drain cleaners safe to use?+
They can damage older pipes with repeated use and are a safety hazard if you need to open the trap afterward. Mechanical methods (plunger, snake) are generally the better first step.
Why does my drain clog again a few weeks later?+
If a snake only partially clears the clog, or grease keeps building up, the same spot will clog again. A full mechanical clearing or a professional camera inspection can find the real cause.