The correct way to use toilet rim blocks - YouTube
How to Place a Toilet Rim Block - Instructables
Toilet rim block - Wikipedia
How to Place a Toilet Rim Block - Instructables
Domestos Toilet Rim Block with Power of 5, Lime, Limescale Removal with Long Lasting Fragrance, Provides Hygiene & Shine, 55 gm : Amazon.in: Health & Personal Care