Rust

I had the pleasure of watching rusty water spill out of a metal side table onto my colored concrete the other day. Now I have this great stain in plain sight... Anyone know of any product that will get rid of rust and not effect the color of the concrete? Or how about just getting rid of the rust?

How old is the concrete... what has it been sealed with (how recently)

It's about 4 years old and it has a little color added so it's not the standard gray. I don't think it has been sealed.

I was able to remove rust stains from my colored concrete using muriatic (swimming pool) acid. You should probably test in an inconspicuous spot for color fastness first.