The building I clean had me put in these blue toilet cleaner things to help with the rings forming but it's creating a blue ring. Any ideas? : r/CleaningTips
Amazon.com: Ty-D-Bol Toilet Cleaner, Cleans and Deodorizes Toilet and Bathroom, Blue, Easy to Use, 5 Tablets, Single Pack : Health & Household
How To Remove Stains Caused By Lysol Cling Gel Toilet Bowl Cleaner
File:Blue toilet water.jpg - Wikimedia Commons
120 X Automatic Bleach Toilet Bowl Cleaner Stain Remover Blue Tablet Flush Tank - Walmart.com
Lysol Automatic Toilet Bowl Cleaner, Power & Blue 6, Atlantic Fresh, 2ct - Walmart.com
Amazon.com: 2000 FLUSHES-20801 Blue Plus Bleach Automatic Toilet Bowl Cleaner, 3.5 OZ ( Pack Of 1 ) : Health & Household