OK I have 2 questions. But first a description of the problem. We have a fairly new house <5yrs with Bemis brand toilet seats. About a month ago during our regular cleaning. We noticed that the seat began turning blue, ONLY where there was skin contact. (Yes we have blue butt prints on our toilet seats.) We normaly use scrubbing bubbles to clean with. The blue azz print will not come off with normal cleaning or even with bleaching. 1. What in the heck is going on? 2. How can we get it off?