Which item is best suited for removing tough stains from a toilet bowl?

Using a pumice stone is highly effective for removing tough stains from a toilet bowl primarily due to its abrasive properties. Pumice stones are natural volcanic rocks that can safely scrub away mineral deposits, hard water stains, and other stubborn marks without scratching the ceramic surface of the toilet. The stone's texture allows it to break down and lift stains while being gentle enough not to cause damage, making it a preferred choice for cleaning toilet bowls.

In contrast, a toilet brush might not provide the necessary abrasiveness needed to tackle tough stains, as it is designed primarily for routine cleaning rather than deep stain removal. A putty knife, although sharp, is not suitable for this purpose as it may scratch the toilet’s surface and damage the finish. Lastly, a pressure washer, while powerful in its cleaning capabilities, is impractical for toilet bowl cleaning and could lead to spills or splashes in an indoor environment, making it an ineffective choice for the task at hand. Thus, the pumice stone stands out as the best option for effectively tackling tough toilet bowl stains.