How to Unclog a Sink Drain

Common Causes of Sink Drain Clogs

Sink drains clog for different reasons depending on location: bathroom sinks accumulate hair, toothpaste, and soap scum; kitchen sinks clog with grease, food particles, and soap buildup. Identifying the cause helps you choose the most effective solution.

Method 1: Drain Snake for Hair Clogs (Bathroom Sinks)

Hair is the most common cause of bathroom sink clogs. The FlexiSnake Drain Weasel is the most effective tool for this: insert the flexible wand into the drain, rotate the handle, and the micro-hook tip grabs and pulls out hair clogs completely. It comes with 5 disposable wands and is made in the USA. Much more effective than chemical cleaners for hair clogs because it physically removes the blockage rather than just dissolving it partially.

Method 2: Baking Soda and Vinegar (Grease and Soap Buildup)

For grease and soap scum buildup in both bathroom and kitchen sinks:

1. Remove any standing water from the sink
2. Pour ½ cup of baking soda down the drain
3. Follow with ½ cup of white vinegar
4. Cover the drain and let fizz for 15–30 minutes
5. Flush with boiling water (or very hot tap water for PVC pipes)

Method 3: Chemical Drain Cleaner (Stubborn Clogs)

For stubborn clogs that don't respond to physical removal or baking soda, Amazon Basics Max Strength Drain Cleaner Gel dissolves hair, grease, and soap buildup effectively. It's safe on all pipe types. Pour according to package directions, wait, then flush with hot water. Use as a last resort after trying physical methods first.

Method 4: Clean the P-Trap

If the above methods don't work, the clog may be in the P-trap — the curved pipe under the sink. Place a bucket under the P-trap, unscrew the slip nuts by hand or with pliers, remove the P-trap, clean it out, and reassemble. This clears clogs that are too deep for a drain snake.

Prevent Future Clogs

Install a drain hair catcher in your bathroom sink to catch hair before it enters the pipe. For kitchen sinks, avoid pouring grease down the drain and run hot water after each use.

Final Thoughts

Most sink clogs are easy to clear at home. Use a drain snake for hair clogs, baking soda and vinegar for grease buildup, and a drain cleaner gel for stubborn blockages. Install a hair catcher to prevent future clogs.