The mystery of the bathroom
September 19, 2005 10:56 AM Subscribe
What's this blue residue in my sink and tub?
posted by Big Fat Tycoon to Home & Garden (14 answers total)
In my new apartment, I've noticed over time a visibly blue residue build up in the bathroom sink and the bath -- they're both white so it's quite obvious, but I'm not sure if it's happening in my kitchen sink. I did some basic googling and found that people talked about over-acidic water possibly corroding copper pipes and causing this, but I asked my landlord who lived in the place just prior to me and said he's never encountered the problem. Could it possibly be the soap I'm using? Why does it only seem to leave a residue in a particular pattern, instead of over the entire span of the tub? The residue can be rubbed off pretty easily, but comes back after a few days.