... so my cat has decided recently that she doesn't want to go to the bathroom in her litter box like she's supposed to, she'd rather go in the floor. I took her to a vet and he said everything looks normal and there's no reason she should be doing what she's doing. Anyway, last night while I was sleeping she decided to go in the bathtub. Obviously, I didn't find it until I woke up. I picked it up, but there's a big brown spot under it... I scrubbed it with everything I can think of, but it's not budging. It's not fading at ALL and it's not even Kind of acting like it might come up. It looks more like it ate the enamal off or something. Does anyone know why this happened or if there's anything I can do to clean it off? Thanks!

We have a product here called Gumption, I don't know if it's available in America but it works to remove stains from ceramic and tile.
Try your local supermarket and look for ceramic/porcelain specific stain removers.

What I have done for stubborn stains on bathtubs and sinks is sprinkle a good bit of Comet on the stain. Then put like 4 or 5 paper towels on top of it and then poor some Clorox bleach on top of the paper towels enough to soak them really good. Leave it sit for an hour or so and then wipe it up.

Awesome! I'm willing to try anything... I'll give it a shot! Thanks!

The bleach trick worked... FINALLY!! Thank you SO much!

Glad it worked... just don't try it on carpeting
:D

Lol... yeah, that would be a disaster, wouldn't it!