It isn't magic but with a little elbow grease it gets the job done. Performance I have an ivory toilet in the guest bathroom that doesn't get used much. For some reason it gets a little streak of rust stain inside of the rim after it sits for a while without use. (I don't understand *why *because we have soft water and none of the other toilets get a rust stain.) I have tried using toilet cleansers, rust remover products and even a pumice stone but nothing seemed to phase the stain. One day I was shopping for something completely unrelated when I noticed the bright yellow package of the Zud Cream Cleanser. The label stated that it was made with a light pumice abrasive mixed with oxalic acid that could dissolve tough rust stains mineral deposits. I had used Zud powder cleanser in the past and liked it so I bought a bottle and returned home. I liked the idea that Zud was a cream cleanser [like Soft Scrub] and wouldn't damage the finish of the toilet but then, again, I had already tried Soft Scrub and it hadn't made a dent in the rust stain so I was skeptical but hopeful that Zud would actually work. The first swipe of the Zud cleanser didn't work either. I was disappointed. I decided to turn off the water, coat the toilet surface where the stain was and let it sit. After an hour or so I used a sponge and scrubbed the cleanser off. Ta-da! The stain was lighter but not completely gone. I tried it one more time and the rest of the stain disappeared.