Remove irrigation rust stains on concrete?

[h linamen]

Our church has some rather severe iron rust stains on the side walk from irrigation. Anyone know of a good way to remove the stains?

[swampy]

A solution of Iron-Out should do it.

[OWC Jamie]

Pray would seem the least amount of effort. :-)

[Ken Sp.]

Do any of the stains look like the Virgin Mary---if so, you could eBay it to GoldenPalace.com

[D-Rod]

Don't know if it works on concrete but how about CLR (calcium, lime, rust)?

[Dick Moore]

Oxalic acid does it, and is found in many commercial rust stain removers.

[Racer X]

also used as a pool cleaner for the concrete lining. look for it at a paint supply store.

[mikebw]

how about a giant magnet? Or is rust not ferrous, hmm...