Start with the strainer and visible debris, then clean the removable trap if accessible. Use a sink plunger with the overflow sealed. If multiple fixtures are slow, the blockage returns, or sewage is present, stop and call a plumber.
Step by step
Identify the scope
Check whether one fixture or several are affected. Multiple slow drains can indicate a branch or main line problem.
Remove local debris
Lift the strainer, remove hair or residue, and clean an accessible trap over a bucket after protecting the area.
Plunge with a seal
Add enough water to cover the cup, seal any overflow, and use controlled strokes to move the blockage.
Escalate safely
If the drain remains slow, use an appropriate hand tool only if you understand the pipe layout. Stop for repeated or widespread blockages.
Expert tips
- Never mix drain chemicals.
- Avoid boiling water on materials that can soften or crack.
- Use sink strainers to prevent repeat blockages.
Common questions
Can baking soda and vinegar unblock a drain?+
They may loosen light residue but rarely clear a substantial hair, grease, or solid blockage.
Why does my drain keep blocking?+
Repeated issues can come from poor pipe fall, roots, damaged pipework, grease buildup, or a blockage farther downstream.
When is a blocked drain urgent?+
Treat sewage backup, overflowing fixtures, multiple affected drains, or water near electrical equipment as urgent.
Stop if the work involves structural uncertainty, hazardous materials, heights, live services, gas, serious water damage, or regulated work. Local rules differ—use an appropriately licensed professional where required.