2 things: 1 How do you remove rust stains from tile & grout?

2 What do you use to seal grout and briefly explain how to properly apply it?

Thanks Mark and anyone who can help.

I'm not sure I've ever seen rust stains on tile I was trying to clean. If your grout cleaning product and process didn't seem to work, I would try a good rust remover. I use the rust stain treatment that Vacaway makes, and have found it to work well on carpet fibers.
I have also heard people report success in removing rust stains from grout using the following products:
---dishwashing detergent
---laundry detergent
---hydrogen peroxide (the strongest are found at beauty
supply stores)
---oxy-bleach, in paste form. Allow 30 minutes to work.
---a paste of hydrogen peroxide & cream of tarter
---a paste of baking soda & lemon juice.

Good luck. Please report back on what worked for you.

I forgot to mention: the ultimate authorities on grout cleaning are to be found at www.dirtygrout.com.

Baking soda & nongel toothpaste worked well on the rust. Also dirtygrout.com is an awesome website. Thanks!