Soft Scrub In-Tank Toilet Cleaner Duo-Cubes, Alpine Fresh, 2 Count

Amazon.com Price: $1.98 (as of 17/10/2020 08:15 PST- Details)

Helps fight toilet ring, hard Water, and lime scale stains
Safe for toilet components
Just drop it in the tank and enjoy the cleaning and Freshening benefits for up to four weeks