I don't know if this is the place to post this but I really want to share what I have found to get rid of the ugly blue ring in the toilet bowl. After several years of trying all kinds of "answers" here's what I found to work. First clean the bowl then put straight Clorox on the ring and let that sit for an hour or so. I then sprayed the ring with Clorex Cleanup and let that sit for a while, clean with a toilet brush. Do the cleanup spray several times till you remove the entire blue stain.