"Dave Smith" > wrote in message
...
> I can see that. This one was a bathroom sink. If there is any
> significant amount of dirt it just sits there while the water drains past
> it, not enough slope to take the dirt with it. Kitchen sinks are
> generally sloped just enough to allow the dirt to flow with the water, but
> flat enough to stand things up in.

My SIL had a bad sink in her cabin bathroom. It was one of those cheap
vanities with the built in top. It sloped upwards where the drain hole was.
So not only did the dirt sit there, but if you wanted it to go down, you had
to push it down with your hands. She even asked me to do this! I was
like... Uh. No. I'll just use the kitchen sink.