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A clogged kitchen sink is the most common plumbing service call we run, year-round. The good news: about 70% of kitchen sink clogs clear with the right DIY approach. The bad news: doing the wrong thing - especially using chemical drain cleaners on certain types of pipes, or calling a plumber too soon - costs money or causes more damage. Here is what actually causes kitchen sink clogs, what works to clear them, and when to call.
What's Actually Down There
Kitchen sink clogs are different from bathroom clogs. Bathrooms get hair and soap. Kitchens get the worst possible mix:
Cooking grease. The biggest culprit by far. Hot grease goes down liquid and hardens in the cooler pipe walls. Layer after layer builds up over months until the pipe is half its original diameter.
Food particles. Coffee grounds, rice, pasta, and starchy foods all stick to grease layers and accelerate buildup. Coffee grounds are especially bad because they refuse to break down.
Soap scum. Combines with grease to form a hard, waxy coating.
Mineral scale (Texas). Hard water deposits build up on the inside of older pipes and provide a rough surface that catches everything else.
By the time your sink is fully clogged, the line has been getting slower for weeks or months - you just did not notice until it failed completely.
What to Try First (In Order)
### 1. Boiling Water (If You Have PVC, Skip This)
For pipes that are metal (cast iron, copper, galvanized): A kettle of boiling water poured slowly down the drain melts soft grease and breaks up early-stage clogs. Pour a kettle, wait 5 minutes, run hot water from the tap. Repeat once if needed.
Skip this if you have PVC pipes. Boiling water can warp PVC at the joints. Use very hot tap water instead - still effective on softer grease.
How to know which you have: Look under the sink at the trap. PVC is white plastic. Copper is reddish-brown metal. Galvanized is dull gray. Cast iron is heavy black metal.
### 2. The Plunger (Right Type Matters)
Use a CUP plunger (flat-bottomed) for sinks, NOT a flange plunger (with the cone - that one is for toilets). Fill the sink with 2–3 inches of water to seal the plunger cup. If you have a double sink, plug the other side with a wet rag - otherwise air just bypasses through the second drain.
Push down slowly to compress, then yank up sharply. 10–15 cycles. The combination of pressure and suction often dislodges grease clogs.
### 3. Baking Soda + Vinegar (Maintenance, Not Heavy Clogs)
Pour 1 cup of baking soda down the drain, followed by 1 cup of white vinegar. The reaction foams and breaks up light buildup. Let sit 30 minutes. Flush with hot water.
Honest assessment: this works for slow drains and prevention. It will NOT clear a fully clogged drain. Skip past this for emergencies.
### 4. Skip the Chemical Drain Cleaners
We do not recommend Drano, Liquid Plumr, or similar chemical cleaners for kitchen sinks for three reasons:
1. Grease laughs at them. Most chemical cleaners are designed for hair (bathroom drains). Grease and food clogs are different chemistry. They rarely fully clear.
2. They damage pipes over time. Sodium hydroxide (the active ingredient in most) corrodes metal and degrades PVC at fittings.
3. They make plumber visits dangerous. If your DIY fails and we have to come out, the chemical sitting in the trap can splash on us when we open it. Some plumbers refuse to work on chemically-treated drains, or charge a hazmat surcharge.
If you have already tried Drano and it didn't work, run a lot of water through the system before a plumber arrives.
### 5. The P-Trap Method (DIY-Friendly)
If hot water and plunging don't work, the clog is usually right under the sink in the P-trap (the U-shaped bend). This is a 15-minute DIY fix:
1. Put a bucket under the trap.
2. Loosen the slip nuts on either side of the trap (by hand or with channel-lock pliers).
3. Lower the trap. Brace yourself for a fountain of water and gunk.
4. Clean out the trap with an old toothbrush or coat hanger.
5. Snake the pipe stub on the wall side with a coat hanger or a small hand-held auger to clear anything just past the trap.
6. Reassemble. Hand-tight is correct - these are designed not to need tools to seal.
7. Run water and check for leaks.
If you cleaned the trap and the drain still does not work, the clog is past the trap, in the wall or branch line. That is when to call.
### 6. Hand-Held Drain Snake / Auger
A 25-foot manual drain snake costs $20 at any hardware store. After clearing the trap, feed the snake into the wall pipe and crank. Most kitchen clogs are within 5–10 feet of the sink.
What Plumbers Actually Use (And What We Charge)
Motorized drain auger: $250–$450. Larger snake reaches further into the line. Usually clears clogs within 25 feet.
Hydro jetting: $400–$800. High-pressure water (3,000–4,000 PSI) scours the entire line, removing decades of grease buildup. We recommend this for homes 15+ years old where a snake provides only short-term relief - buildup just rebuilds in months. Hydro jetting actually restores pipe diameter.
Camera inspection: $200–$400. Used when the line keeps clogging or when we suspect a deeper issue (pipe belly, root intrusion, or a damaged section). Often included free with hydro jetting.
Pipe replacement: $1,500–$5,000 if the line is damaged or galvanized pipe has corroded internally beyond cleaning.
How to Prevent the Next Clog
Don't pour cooking grease down the drain - ever. Pour into a can, let it solidify, throw it out. The single most impactful habit you can adopt.
Run hot water for 30 seconds after every kitchen sink use. Especially if you used soap. Keeps soft buildup from settling.
Use a strainer. $5 metal mesh basket strainer in every kitchen sink drain. Catches food before it reaches the pipe.
Skip the garbage disposal for problem foods. Coffee grounds, rice, pasta, fibrous vegetables (celery, onion skins, potato peels), grease, and bones do not belong in a disposal regardless of what the manual says. Throw them in the trash.
Run hot water with disposal use. Keeps everything moving past the disposal trap.
Annual maintenance hydro jet for older homes. If your home is 25+ years old or has had repeat clogs, an annual hydro jet ($400–$800) prevents emergencies.
When to Call Us
Call same-day if: Multiple drains are slow at once. Sink completely clogged after trying all DIY steps. Water is backing up into a different fixture (e.g., dishwasher). Sewer smell from the drain.
Schedule routine service if: Drain has been getting slower for weeks. Repeat clogs every few months. Older home that has never had a hydro jet.
Same-day kitchen sink clearing across Central Texas - Pflugerville, Bastrop, Taylor, Elgin, Georgetown, Hutto, Manor, Cameron, Rockdale, Brenham, and our full service area. Call (737) 260-7255. Texas license M-37654. Flat-rate pricing on every drain service.