Rust on Driveway and Sidewalks

[dabears63]

Hey guys, any tips on removing rust stains from a concrete driveway and sidewalk?
In the past I have used, and had pretty good luck, with RustAid from Home Depot. This time around it is not even phasing it. It’s not well water it is City of Tampa, they have TruGreen or Scotts, so I assume it is from the iron in the fertilizer. Whatever I use it has to be safe for St.Augustine turf. Any thoughts would be welcomed and appreciated.
Thanks
Doug

[FCPWLLC]

Try oxalic acid. Keep vegetation wet. Apply to entire area or you'll see the cleaned area versus the not so clean area.

[dabears63]

Thanks, I'll give it a try.