in and they had rusted around the drain. The other day, I put some water w/bleach in the sink and I forgot about it. A couple of days later I went in there and the water in the sink was black. Really black. I thought, at first, that the sewer had backed up, but I looked in the commode and everything was fine. Then I remembered I had left the bleach water in there. My question is, would the bleach water have reacted with the rust to cause this and how do you get the stain out. It looks like black ink has stained it. I have used Comet and a stiff brush and gotten some of it out, but it still looks bad.