What type of chemical is most effective in removing the build-up of "lime" that is often found in toilet bowls?

Question

Quizplus · Accepted Answer

Lime scale is primarily composed of calcium carbonate, which is a base. Therefore, an acid would be the most effective in breaking down and removing this build-up. Acids commonly used for this purpose include hydrochloric acid, phosphoric acid, and citric acid. However, caution must be taken when using these acids, as they can cause eye and skin irritation and damage to plumbing fixtures if not diluted or used properly.

What Type of Chemical Is Most Effective in Removing the Build-Up