Toilet bowl cleaner is highly effective because it contains powerful ingredients like hydrochloric acid or sulfuric acid, ...

Additionally, acids can penetrate and eliminate tough stains that are resistant to less potent cleaning agents, ensuring a sparkling clean toilet bowl. Related: How to Clean Calcium Buildup in the ...

We use a combination of methods to assess how well a toilet gets the entire bowl clean. First, we use a water-based red paint to create a solid rectangular shape above the waterline in the front ...