Cleaning the "holes" in the BA sink drainpipe
I have tried several things, but nothing works, so I am hoping that some of you have ideas. In our bathroom sink drainpipe, about an inch below the opening, there are holes. Apparently there is a space in there for whatever reason. The problem is that mine is full of black gunk, and I can't get it out. I have tried a small bottle brush and a pipe cleaner, but didn't have much luck. The bottle brush got a little bit out.
Any success stories? Thanks!