Amazon.com: Ty-D-Bol Automatic Toilet Bowl Cleaner Liquid, In-Tank Liquid Cleaner for Toilet Bowl, Original Blue, 12 Oz (Pack of 6) : Health & Household
In-tank toilet cleaning tablet - Wikipedia
Vacplus Automatic Toilet Bowl Cleaner Tablets, Bathroom Toilet Tank Cleaner (20 PACK) : Amazon.ca: Health & Personal Care