Slow or clogged drains are one of the most common household plumbing problems. Before you reach for a harsh chemical drain cleaner, which can damage older pipes and is dangerous to handle, try these chemical-free DIY methods to unclog a drain. Start with the gentlest option and work your way down the list.
Method 1: Hot water flush
For kitchen sinks clogged with grease, carefully pour a kettle of very hot (not boiling) water down the drain in two or three stages. Avoid boiling water with PVC pipes or porcelain sinks, as extreme heat can soften joints or crack fixtures.
Method 2: Use a plunger correctly
Use a cup plunger for sinks and tubs. Fill the basin with enough water to cover the plunger cup, block the overflow hole with a wet rag, then plunge firmly 10–15 times while keeping a tight seal. Double sinks need the other drain plugged.
Method 3: Baking soda and vinegar
Pour half a cup of baking soda into the drain, followed by one cup of white vinegar. Cover the drain and wait 15–30 minutes, then flush with hot water. This works best on minor buildup and as a monthly maintenance routine.
Method 4: Drain snake or hair-clog tool
Bathroom sinks and showers are usually clogged by hair and soap. A plastic barbed drain stick or a small hand-crank drain snake (auger) can pull out the clog in minutes. Feed it in slowly, twist and pull back, then run hot water to rinse.
Method 5: Clean the P-trap
If the sink still won’t drain, place a bucket under the curved P-trap below the sink. Loosen the slip nuts by hand or with tongue-and-groove pliers, remove the trap and clean it out. Reassemble hand-tight plus a quarter turn and check for leaks.
Safety tip: Wear gloves and eye protection. Never mix different drain products, and never use a plunger right after a chemical cleaner has been poured in.
How to prevent clogs
- Use drain strainers in showers and sinks.
- Never pour grease, coffee grounds or fibrous food scraps down the kitchen drain.
- Flush drains monthly with hot water and baking soda.
Why Chemical Drain Cleaners Aren’t Worth It
Harsh drain cleaners work by generating heat or strong reactions. That can soften old PVC joints, damage metal pipes and splash back into your eyes. They also sit in the trap if they don’t clear the clog, which makes any later repair dangerous. Mechanical methods like plungers and snakes are cheaper and safer.
How to Unclog a Kitchen Sink With a Garbage Disposal
If the sink has a disposal, run it first with cold water. A jammed disposal can look like a clog. Our guide on how to fix a garbage disposal that won’t turn on explains how to free it. Then plunge the other side of a double sink while holding a wet rag over the disposal side.
Clearing a Slow Bathtub Drain
Tub drains collect hair right under the stopper. Unscrew or lift out the stopper and pull out the hair with a drain stick. While you’re there, check the caulk around the tub. If it’s cracked, follow our guide on how to caulk a bathtub.
When to call a professional
If several drains are slow at once, water backs up into a tub or shower, or you notice sewage smells, the problem may be in the main sewer line. That job calls for a licensed plumber with professional equipment.
Next, learn how to fix a leaky faucet to finish your DIY plumbing tune-up.
Looking for more beginner-friendly fixes? Browse our easy weekend DIY projects for ideas you can finish in a day.
