I am new here so hope I have not put this in wrong thread. We had new bathroom installed 10 years ago fine till 18 months ago and suddenly water from basin was draining very slowly. Called in our local plumber as we tried everything and what ever was blcoking it wouldn't shift. He had to put in new pipe the old one absolutely clogged up was like concrete. Now it has happened again worse than ever. I am very careful about what goes down sink so was puzzled till I thought about a wellknown mouthwash that my DH was using till about a month ago. I was always complaining that it left a greasy film in the basin and to remove required a spray and clean. DH went onto the internet and found other people had had the same problem and had contacted manufacturer but so far no reply. The advert for it says see the results in the basin after you have used it and in my pipes as well. I wouldn't mind but it didn't do much for DH teeth in fact discoloured a couple. Has anyone else came across this problem?