Try whink rust stain remover, brown bottle can buy in grocery store.

Good luck
maid

Here is a link that might be useful: Linky

Maid,
Thanks for the suggestion. I researched Whink on Amazon.com, and it gets great reviews for removing rust. We'll give it a try.

testing (sorry)

It will remove all the rust. You can even use it on clothes. Great stuff.

Barkeeper's Friend always worked for me. You can also try CLR.

Zud is a powerful cleanser too.

If you use bleach on a porclin tub it will cause a rust stain. To remove the brown spots soak it with regular household peroxide. Try never to allow bleach products such as tilex, or other mold cleaners near the tub. Clr is ok as is clorox2 to clean your tub. Good luck!