When I run the water on my bathroom sink for about 5 seconds, I get a fairly strong wiff of a foul odor, which only lasts a second or two. From then on, I don't smell anything. Some other information:
- If I plug the drain, I don't get the smell. This points to the smell coming out of the drain, and not being in the water or coming out of the faucet.
- The house is about 9 years old. It's a single sink. It drains quickly, without any slowdown. I've lived in the house for a year, and this only started a couple of weeks ago.
- I've tried liquid drano, and a bottle of the foaming "pipe snake" stuff. Didn't make any difference.
- This doesn't happen in the other bathrooms in the house, or any other sinks.
I'm pretty clueless about plumbing and home repair in general, so any tips would be appreciated. I haven't called a plumber yet, and I'd like to avoid it if possible.