bathtub
 

I have a lot of rust stains on my grout, I was thinking about using my dremal tool to take off rust and apply a sealer. any ideas would help. Thanks:)

Welcome Woodman:
I would prefer to do the job chemically to hold down the dust. That type of dust is a carcenogen.
Glenn

Try CLR or LimeAway first, it may save you a lot of work. The sealer is still a good idea afterward.