How to Clean a Sink Drain
To clean a sink drain, remove the stopper or drain cover, pull out any visible hair and debris, pour half a cup of baking soda followed by half a cup of white vinegar down the drain, let it fizz for 10 minutes, then flush with boiling water. Do this monthly to prevent slow drains and odors.
- Time
- 10 min
- Frequency
- monthly
- Difficulty
- easy
- Cost
- Free
What you'll need
- Baking soda
- White vinegar
- Boiling water
- Old toothbrush or small brush
- Paper towel or rag
The steps
- 1
Remove the stopper or drain cover
Most bathroom sink stoppers lift straight out or twist a quarter turn and lift. Some have a pivot rod under the sink that you unscrew by hand to release the stopper. Set the stopper aside. Kitchen sinks usually have a strainer basket that lifts out.
- 2
Clear visible hair and debris
Look down into the drain with a flashlight. Pull out any hair clumps, soap buildup, or debris you can see. A pair of needle-nose pliers or a plastic drain snake (a zip-it tool) works well for grabbing hair that is stuck just below the opening. Wipe the stopper clean with a paper towel.
- 3
Pour baking soda down the drain
Pour half a cup of baking soda directly into the drain opening. Let it sit for a minute so it settles into the pipe. The baking soda deodorizes and provides a mild abrasive cleaning action against buildup on the pipe walls.
- 4
Add vinegar and let it fizz
Pour half a cup of white vinegar into the drain. The mixture will fizz on contact. Cover the drain opening loosely with a wet rag to keep the fizzing action inside the pipe where it does the most good. Let it work for 10 minutes.
- 5
Flush with boiling water
Boil a kettle or pot of water and pour it slowly down the drain to flush the loosened buildup. The heat helps dissolve any remaining soap scum or grease. For kitchen sinks, this step is especially important because grease buildup is the main culprit.
- 6
Use an enzyme cleaner for stubborn buildup
If the drain is still slow after the baking soda and vinegar treatment, use an enzyme-based drain cleaner like Green Gobbler. Follow the product instructions, usually pour it in at night and let it work overnight. Enzyme cleaners break down organic buildup without damaging pipes.
Why sink drains slow down
Every time you use the sink, a thin layer of residue coats the inside of the drain pipe. In bathrooms, the main offenders are hair, soap scum, and toothpaste. Hair catches on the drain stopper mechanism or the crossbars inside the drain, and soap scum glues everything together into a sticky mass that narrows the pipe opening over time.
Kitchen sinks have a different problem. Grease, food particles, and dish soap combine into a film that lines the pipe walls. The film thickens gradually until water drains noticeably slower.
In both cases, the buildup gives bacteria a surface to grow on. That is where the smell comes from. The sulfur compounds bacteria produce are the same reason a neglected drain smells like rotten eggs. A monthly cleaning prevents the buildup from ever reaching the point where the drain slows or smells.
The baking soda and vinegar method
This is the standard approach and it works for routine maintenance on any sink. Baking soda is a mild base that neutralizes odors and provides gentle abrasion. Vinegar is a mild acid that dissolves soap scum and mineral deposits. The fizzing reaction when they combine creates carbon dioxide gas that helps push loosened debris through the pipe.
Pour half a cup of baking soda in first, then half a cup of vinegar. Cover the drain with a wet rag to direct the fizzing action downward into the pipe. After 10 minutes, flush with a full kettle of boiling water.
This method is safe for PVC, ABS, copper, and cast iron pipes. It costs pennies per treatment. The only limitation is that it will not clear a fully blocked drain. For that, you need a plunger, a drain snake, or an enzyme cleaner.
When to use an enzyme cleaner
If the baking soda method does not fully restore drainage, an enzyme-based cleaner is the next step. Products like Green Gobbler contain bacteria cultures that digest organic material (hair, soap, grease) inside the pipe. Pour the cleaner in at night, let it work for 8 to 12 hours while the sink is not in use, and flush with hot water in the morning.
Enzyme cleaners are slower than chemical drain cleaners but safer for your pipes and your lungs. They are especially effective for bathroom sinks where hair is the primary clog material. One treatment usually restores a slow drain to full speed. For stubborn cases, repeat two nights in a row.
Skip chemical drain cleaners (Drano, Liquid-Plumr) for routine use. They work fast but corrode pipes with repeated use, produce dangerous fumes, and are overkill for maintenance cleaning. Save them for emergencies only, and even then a drain snake is usually a better choice.
Prevention is easier than cleaning
A mesh drain cover on every bathroom sink catches hair before it enters the pipe. These cost $2 to $5 and eliminate the most common cause of bathroom drain clogs entirely. Clean the cover every few days by pulling the collected hair off and tossing it in the trash.
Run hot water for 30 seconds after brushing your teeth or washing your face. The heat keeps soap and toothpaste moving through the pipe instead of hardening on the walls. In the kitchen, never pour cooking grease down the drain. Let it cool in a container and throw it in the trash.
With a drain cover and a monthly baking soda flush, most sinks will never develop a slow drain or a smell. The 10 minutes per month this takes is far less effort than dealing with a full clog or calling a plumber.
Frequently asked questions
- Why does my sink drain smell?
- Bacteria feeding on trapped hair, soap scum, and toothpaste residue cause the smell. In bathroom sinks, the combination of hair and soap creates a sticky film inside the pipe that traps more debris and gives bacteria a surface to colonize. A monthly baking soda and vinegar flush kills the bacteria and dissolves the film.
- When should I call a plumber instead of cleaning the drain myself?
- Call a plumber if multiple drains in your house are slow at the same time (that points to a main line problem, not a single drain), if water backs up into another fixture when you run the sink, or if the drain is completely blocked and a plunger plus enzyme cleaner have not helped after 24 hours. A single slow drain is almost always fixable yourself.
- Is baking soda and vinegar better than chemical drain cleaners?
- Yes, for routine maintenance. Chemical drain cleaners like Drano contain sodium hydroxide or sulfuric acid that can corrode pipes over time, especially older metal pipes and PVC joints. They also produce toxic fumes in enclosed bathrooms. Baking soda and vinegar are safe for all pipe types, cost almost nothing, and work well for preventing buildup. Chemical cleaners are a last resort for severe clogs, not a maintenance tool.
- How do I prevent sink drain clogs?
- Use a mesh drain cover or hair catcher over the bathroom sink drain. Run hot water for 30 seconds after each use to flush soap and toothpaste through. Do the baking soda and vinegar flush monthly. In kitchen sinks, never pour grease down the drain and always run water when using the disposal. These habits prevent 90 percent of clogs.
Products you'll need
This section contains affiliate links. We may earn a commission at no cost to you.
Green Gobbler Drain Clog Dissolver
Enzyme-based drain cleaner, safe for all pipes
As an Amazon Associate we earn from qualifying purchases. The Home Almanack may earn a commission on products purchased through links on this page, at no additional cost to you.
Never forget this task again
The Home Almanack tracks every maintenance task your home needs and reminds you automatically. Takes about 30 seconds to set up.
Get free reminders — never miss it againRelated guides
How to Descale a Showerhead
Descale a clogged showerhead in 30 minutes with white vinegar. Soak it to dissolve mineral buildup and restore full water pressure.
How to Clean and Refresh a Garbage Disposal
Freshen a smelly garbage disposal in 5 minutes with baking soda, vinegar, and ice. Deodorizes, cleans the grinding chamber, and sharpens the blades.
How to Recaulk Your Sinks
Recaulk bathroom and kitchen sinks in 30 minutes with silicone caulk. Prevent water damage, mold, and countertop rot by replacing cracked or peeling caulk around the sink joint.