Q: Why does my sink drain slowly even after using Drano?
A: Drano and other liquid cleaners only break down organic matter, not solid buildup. Hair, toothpaste, soap scum, and even minerals can form a partial blockage in your P-trap or drain line. When the chemical can’t reach the clog, it doesn’t clear it.
Q: Why does plunging fix it temporarily?
A: When you plunge, the air pressure temporarily moves debris, allowing the water to flow freely for a short time. But if the blockage is deeper or sticky, it quickly reforms once you start running water again. That’s why the problem returns right away.
Q: Could the clog be in the P-trap?
A: Yes, the curved section under your sink, called the P-tra,p often collects debris. If the upper bend appears glued, it’s probably PVC with a slip nut hidden behind the bend. Use adjustable pliers to loosen the nut and remove the trap for inspection. Place a bucket underneath to catch water first.
Q: My snake won’t go down. What should I do?
A: Try feeding the snake from the wall pipe after removing the P-trap. If that’s glued, you may have a glued trap arm — common in older homes. In that case, use a small hand auger through the sink’s overflow opening instead. This method often clears hair clogs right at the top of the drain.
Q: Could a vent pipe cause this?
A: Absolutely. A blocked vent pipe prevents air from entering your drain system, causing slow drainage and gurgling. If nearby drains are also slow, it’s likely a vent issue. In that case, it may be time to call a professional plumber.
Q: What’s the best long-term solution?
A: Manually cleaning the P-trap and drain arm is the most effective fix. Flush with hot water and mild detergent afterward. Avoid chemical drain cleaners, as they can damage pipes and rubber seals over time.
For more tips on unclogging bathroom drains, visit this guide from Family Handyman.
I’m Chris Mayer, writing for Plumbing 101.
