Bad smell from bathroom sinks
Our bathroom was remodeled 2 years ago and new sinks and pipes were installed. Now we have a bad earthy "dirt like" smell coming from the bathroom sinks. Rather strong. If you close off the sinks it seems to stop the smell. I shined a flashlight down the sinks and the pipe don't look dirty (only 2 years old).
Water drains fine, no slowness at all.
Toilet flushes fine.
No smell from the tub drain.
I've tried baking soda couple times, but no luck at all. Any suggestions on causes and resolutions?
ps - we are on a septic system that is pumped every 2-3 years (2 in house)