Pack of 6 - Toilet Cistern Blocks Clean Freshener Blue Loo Bathroom Tablets 5056170304931 | eBay
In-tank toilet cleaning tablet - Wikipedia
How to Clean a Toilet Cistern
Mighty Burst Fresh Blues Toilet Block, 6 Pack, Cistern Blocks That Freshen, Cleans and Leaves Sparkling Blue Water, Freshens The Bathroom, FBTB724 : Amazon.co.uk: Grocery
Royal Flush Cistern Blocks - 24 Tub - hygiene4less