A clogged sink is one of the most common plumbing problems homeowners face — and also one of the most annoying. Standing water in your kitchen basin while you’re trying to cook, or a bathroom sink that drains so slowly it fills up during face-washing, can throw off your entire routine.
The team at Water Pressure Repair has cleared thousands of sink clogs across Upland and the Inland Empire. In this guide, we’ll walk you through the most effective methods to unclog a sink yourself — and explain exactly when it’s time to stop DIYing and pick up the phone.
Kitchen Sink vs. Bathroom Sink: Different Clogs, Different Fixes
Before you start, it’s important to know what’s typically causing the clog, because kitchen and bathroom sinks get clogged for very different reasons
Kitchen Sink Clogs Are Usually Caused By
- Grease and cooking oil that solidifies inside pipes
- Food particles that slip past the drain cover
- Dish soap residue that accumulates over time
- Coffee grounds that compact into a dense plug
Bathroom Sink Clogs Are Usually Caused By
- Hair that wraps around the drain stopper or drain basket
- Soap scum that builds up on pipe walls
- Toothpaste and product residue
- Small items like jewelry caps or cotton swabs
Step 1: Remove and Clean the Drain Stopper
In bathroom sinks, a significant number of clogs begin right at the pop-up drain stopper — the small plug controlled by the rod behind your faucet. Hair and soap scum accumulate around it over time.
To clean it: Lift or unscrew the stopper (most twist out or can be pulled up), remove all hair and debris, rinse it thoroughly, and reinsert it. Run hot water to test if the drain is now clear.
Step 2: Use a Zip-It Tool or Drain Wand
A zip-it drain cleaning tool (available at any hardware store for a few dollars) is a long plastic wand with small barbs along the sides that grab and pull out hair clogs. Insert it into the drain, wiggle it around slowly, pull it out, and dispose of whatever comes up. Repeat until the drain runs freely.
This is the most effective single tool for bathroom sink hair clogs and avoids pushing the clog further down the pipe.
Step 3: Clean the P-Trap
The P-trap is the curved pipe section directly under your sink — the U-shaped bend you can see when you open the cabinet below. It’s designed to hold a small amount of water that blocks sewer gases, but it’s also a prime location for clogs to accumulate.
To clean it
- Place a bucket under the P-trap to catch water
- Unscrew the slip nuts on both ends of the curved section by hand or with pliers
- Remove the P-trap and clear out any debris
- Rinse it with hot water, then reattach
Be prepared — P-traps often hold dark, foul-smelling water and debris. This is completely normal.
Step 4: Try a Plunger
For kitchen sink clogs, a cup plunger is often very effective. Fill the sink with a couple of inches of water, place the plunger directly over the drain, create a firm seal, and pump vigorously 15–20 times. Release and let the water drain. Repeat if necessary.
If you have a double kitchen sink, plug the second drain with a wet rag before plunging to ensure the suction works properly.
Step 5: Baking Soda and Vinegar Flush
This natural combination can break up soap and grease buildup without damaging your pipes
- Pour 1/2 cup of baking soda down the drain
- Immediately follow with 1/2 cup of white vinegar
- Cover the drain and wait 20–30 minutes
- Flush with very hot water
This works best as a regular maintenance flush to prevent clogs rather than clearing a complete blockage.
What NOT to Do When Unclogging a Sink
Many homeowners make these common mistakes that can worsen the problem or damage pipe
- Do NOT pour chemical drain cleaners repeatedly — they corrode pipes over time and rarely solve the root cause
- Do NOT use a wire hanger as a drain snake — it can scratch pipe walls and push clogs further down
- Do NOT ignore a slow drain — catching it early means a much simpler fix
- Do NOT use boiling water in PVC pipes — it can warp or loosen joints
When to Call a Professional Plumber
Stop DIYing and call Water Pressure Repair if
- You’ve tried all of the above methods and the sink still won’t drain
- The clog keeps returning after you clear it
- Other drains in your home are also slow or backed up
- You notice a sewage smell coming from the drain
- There is water leaking from under the sink or in the cabinet below
These situations may indicate a deeper blockage in the branch line or main sewer line, a damaged pipe, or a venting issue — none of which can be resolved with household tools.
Professional Sink and Drain Cleaning — Upland, CA
Water Pressure Repair provides fast, affordable, and guaranteed sink drain cleaning for homes and businesses throughout Upland and the Inland Empire. Our licensed technicians use professional-grade drain cameras and hydro-jetting equipment to completely clear even the most stubborn sink clogs.
Call us at 909-935-2665 for same-day service. We’re available 24/7 for drain emergencies — because a clogged sink can’t always wait until Monday morning.