The best way to unclog a bathroom sink is to plunge it or use a zip tie, as outlined above. If this doesn’t work, you can try ...

Q: My bathroom sink isn’t draining ... While you’re at, remove any items store under the sink. Leave only a bucket placed directly underneath the P-trap to catch dirty water.

Then, get under ... sink stoppers and watch for telltale dribbles. Joints are the most likely source of leaks, but old metal ...