How to Unclog a Slow Bathroom or Kitchen Drain

By Sam · Reviewed by CaseyLast updated July 1, 2026

A slow drain is almost always caused by a clog of hair, soap residue, or food buildup sitting just below the surface — and most of the time, you can clear it yourself with a plunger or a simple homemade mixture, without calling a plumber or using harsh chemical drain cleaners. Start with the gentlest method first and work your way up only if needed.

Step 1: Clear what you can see

1. Remove the drain stopper or cover if your sink has one — it usually lifts out or unscrews by hand.
2. Look for visible hair, soap scum, or debris sitting right at the opening.
3. Use a gloved hand, an old toothbrush, or a bent wire (like an unfolded wire coat hanger) to pull out anything you can reach. This alone often solves the problem.

Step 2: Try boiling water (kitchen sinks especially)

1. Boil a full kettle or pot of water.
2. Carefully pour it directly down the drain in two or three stages, waiting several seconds between pours.
3. This can melt and loosen grease or soap buildup clinging to the inside of the pipe.

Caution: Skip this step if you have PVC pipes that feel very old or brittle, or if your sink has a garbage disposal — check with the manufacturer’s guidance first, since some disposals shouldn’t have boiling water poured directly in.

Step 3: Use a plunger

1. If your sink has an overflow hole (a small opening near the top, common in bathroom sinks), plug it with a wet rag so the plunger can build suction properly.
2. Fill the sink with a couple inches of water so the plunger’s rubber cup is covered.
3. Place the plunger firmly over the drain opening, making a full seal.
4. Push down gently, then pull up sharply, repeating 10–15 times.
5. Remove the plunger and check if water drains faster. Repeat if needed.

Step 4: Try baking soda and vinegar

This natural combination can help break down mild buildup:

1. Pour about half a cup of baking soda down the drain.
2. Follow with half a cup of white vinegar. It will fizz — this is normal.
3. Cover the drain (a wet rag or the stopper works) and let it sit for 15–30 minutes.
4. Flush with hot (not necessarily boiling) water.

Step 5: Use a drain snake for stubborn clogs

A drain snake (sometimes called a zip tool or drain auger) is an inexpensive plastic or wire tool made for exactly this job, sold at most hardware or grocery stores.

1. Insert the snake a few inches into the drain.
2. Slowly push it further in until you feel resistance, then gently twist and pull it back out.
3. Remove any hair or debris caught on the barbs, then repeat once or twice more.
4. Run hot water to check if drainage has improved.

When to skip the chemical drain cleaners

Store-bought chemical drain cleaners can work, but they’re harsh on skin, eyes, and older pipes, and they can make things worse if a plumber later needs to work on the same clog. It’s worth trying the steps above first; if you do use a chemical cleaner, always follow the label directions exactly and ventilate the room well.

When to call a plumber

Call a professional if:

• Multiple drains in your home are slow at the same time (this can indicate a bigger blockage further down)
• Water backs up from a drain instead of just draining slowly
• You’ve tried the steps above without improvement
• You smell sewage near the drain

Frequently asked questions