How to Unclog a Drain
Learn how to unclog a kitchen or bathroom drain using things you already have at home. No chemicals, no plumber, no drama.
The first time we dealt with a clogged drain, we panicked and poured an entire bottle of chemical drain cleaner down the sink. It did not work, it smelled terrible, and we later learned it can damage pipes over time.
Turns out there are faster and safer ways to handle it. Most clogs happen in the first few inches of pipe, right below the drain cover. Hair, soap buildup, food scraps, and grease are the usual suspects. You do not need a plumber for any of them.
This guide covers three methods in order of how easy they are. The first one takes about 30 seconds and fixes most clogs on the spot. Start there and work your way down only if you need to.
Boiling water from a kettle or pot. Baking soda and white vinegar from the kitchen. A pair of needle-nose pliers or a bent wire hanger for pulling out hair clogs. A small bucket and towel if you need to open the P-trap under the sink.
Try boiling water first
Boil a full kettle or large pot of water. Remove any standing water from the sink if you can. Pour the boiling water directly into the drain in two or three stages, waiting a few seconds between pours. The heat melts soap scum and loosens grease that may be causing the blockage. This alone fixes a surprising number of slow drains. Wait a minute and see if the water drains normally.
Heads up: Do not pour boiling water into a porcelain bowl or a drain connected to PVC pipes that are already cracked or old. If you have PVC pipes and are unsure of their condition, use very hot tap water instead of boiling. Boiling water can soften PVC joints over time.
Pull out visible debris
If the boiling water did not clear it, the clog is probably physical. Remove the drain cover or stopper. Most pop-up stoppers twist counter-clockwise and lift out. Shine a flashlight into the drain. You will usually see a clump of hair, soap buildup, or food stuck in the first inch or two. Use needle-nose pliers, a bent wire hanger, or even a zip-tie with small notches cut into it to pull the debris out. This is unpleasant but extremely effective, especially in bathroom sinks and showers.
Use baking soda and vinegar
Pour half a cup of baking soda into the drain. Follow it with half a cup of white vinegar. You will hear fizzing. That is the chemical reaction breaking down organic buildup inside the pipe. Cover the drain with a wet cloth or plug to keep the pressure directed downward. Wait 15 to 30 minutes. Then flush with another pot of boiling water or very hot tap water. This combination breaks down soap scum, grease, and light food buildup without damaging your pipes.
Good to know: For kitchen sinks with grease buildup, add a squirt of dish soap before the boiling water flush. Dish soap is a degreaser and helps break down the oily residue that baking soda alone might not dissolve.
Clean the P-trap if the clog persists
The P-trap is the curved section of pipe under the sink shaped like the letter P or U. Place a bucket underneath it. Unscrew the slip nuts on both ends by hand. Most P-traps have plastic nuts you can turn without tools. Pull the curved section down and let the water drain into the bucket. Check inside for clogs. You will often find a solid plug of gunk in the curve. Clean it out, rinse the trap, and screw it back on. Run water to check the seal for leaks.
Prevent future clogs
Use a mesh drain cover over shower and bathroom drains to catch hair before it goes down. In the kitchen, scrape plates into the trash before rinsing. Never pour cooking grease or oil down the drain. It solidifies inside the pipe and builds up over time. Once a month, do a preventive baking soda and vinegar flush followed by hot water. It takes less than a minute and keeps buildup from accumulating to the point of a full clog.
Nine times out of ten, one of those three methods handles the clog. We keep a box of baking soda under the kitchen sink specifically for this. Once a month, we pour some down with vinegar as a preventive flush. It takes 30 seconds and keeps things flowing. If none of these worked and the water still will not drain, the clog might be deeper in the main line. That is the one situation where calling a plumber actually makes sense. But try the simple stuff first. If the problem is a clogged toilet rather than a sink or shower drain, that requires a different approach. Our guide on how to unclog a toilet covers plunging technique, the hot water trick, and when a toilet auger is the right call.
Questions we get asked about this
Answers from experience, not a textbook.
They work in some cases, but we do not recommend them as a first choice. Chemical drain cleaners can corrode older pipes, damage garbage disposals, and create dangerous fumes if mixed with other cleaning products. They also do not work well on solid clogs like hair balls. The mechanical and natural methods in this guide are safer for your pipes and just as effective for most household clogs.
Buildup inside the pipe can smell even when water drains fine. Bacteria feed on the gunk coating the pipe walls. A baking soda and vinegar flush followed by boiling water usually eliminates the smell. If the smell is like rotten eggs, it could be a dried-out P-trap. Run water for 30 seconds to refill the trap and block sewer gas from rising up.
Yes, a flat-bottom cup plunger works on sinks. Fill the sink with a few inches of water first so the plunger cup can create a seal. Cover the overflow hole with a wet rag to maintain pressure. Pump the plunger up and down vigorously for 15 to 20 seconds. This can dislodge clogs that are just past the drain opening. It does not work well on deep clogs or grease buildup.
Call a plumber if multiple drains are clogged at the same time, which indicates a main sewer line issue. Also call if you have tried all the methods above and the drain is still blocked, if you notice water backing up into other fixtures when you flush or run the sink, or if there is a persistent sewer smell that refilling the P-trap does not fix. Main line clogs require a professional drain snake or camera inspection.
Home Maintenance 101
How to Clean a Microwave
How to Fix a Running Toilet
How to Unclog a Drain
← you’re hereHow to Paint a Room
How to Clean an Oven
How to Hang a Picture
How to Unclog a Toilet
How to Remove a Stripped Screw
How to Remove Rust from Metal