How to Fix a Slow-Draining Bathroom Sink in 15 Minutes

The Secret to a Fast-Flowing Drain (No Harsh Chemicals Required)

Is your bathroom sink filling up with soapy, dirty water every time you wash your hands or brush your teeth? Over time, bathroom drains inevitably slow down due to a sticky combination of hair, toothpaste spit, and soap scum. While your first instinct might be to pour harsh chemical cleaners down the drain, these can actually corrode your plumbing and damage the environment.

Instead, you can clear the blockage in under 15 minutes using simple household items and a little bit of physics. Here is how to do it step-by-step.

Step 1: Clean the Pop-Up Stopper

In 90% of slow-draining bathroom sinks, the clog isn't deep in the pipes—it is wrapped right around the mechanism of your pop-up stopper. Cleaning this is your first and most important step.

• Remove the stopper: Some stoppers can be pulled straight out. Others require you to twist them counterclockwise first. If yours is locked in, go under the sink, unscrew the metal retaining nut holding the horizontal pivot rod, slide the rod back, and pull the stopper out from above.
• Scrape off the gunk: Use a paper towel or an old toothbrush to scrape off the hair, soap scum, and black slime clinging to the stopper. Dispose of this directly in the trash.
• Rinse and replace: Give the stopper a quick wash with dish soap and set it aside for now.

Step 2: Use the Baking Soda and Vinegar Volcano

Now that the physical barrier is out of the way, you can tackle the buildup inside the drain pipe using a natural, fizzing chemical reaction.

• Pour baking soda: Pour about 1/2 cup of dry baking soda straight down the drain opening.
• Add vinegar: Pour 1/2 cup of white vinegar down the drain immediately after. You will hear a loud fizzing sound as the acid and base react.
• Cover and wait: Cover the drain with a rag or the clean stopper to trap the fizzing action inside the pipe. Let it sit for 10 minutes to break down grease and soap scum.

Step 3: Flush with Boiling Water

Once the 10 minutes are up, you need to flush the loosened debris away.

• Boil water: Bring a kettle or medium pot of water to a boil.
• Pour slowly: Pour the boiling water directly down the drain. If you have plastic (PVC) pipes, use hot tap water instead of boiling water to avoid warping the joints.

Step 4: Prevent Future Clogs

To keep your sink draining beautifully, run hot water for 15 seconds after every use to wash away toothpaste residue. Additionally, perform this baking soda and vinegar flush once a month to prevent soap scum from building up in the first place.