I'd left an old pan in the sink for a day or two, and the water caused it to rust and leave an ugly rust stain in the sink. I tried EVERYTHING. I scrubbed and wiped, and nothing worked. Legit, two seconds into scrubbing with this, the stain came off. I swear, it's worth every cent! It doesn't leave any gross smell, and it's real quality stuff. My sink looks perfect now!!