I like to use RSR 2000. I've had good success with it.

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From: "Excel Master Floor Care" <excelmasterfloorcare@cox.net>

Date: Tue, 7 Feb 2012 15:14:15 -0800

To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>

ReplyTo: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>

Subject: [sccpartners] Rust on Limestone

Hi Everyone,

What is the best way to remove rust from a honed, weathered, Limestone that is outside. I have attached a picture.

Thank you,

Tony Warney

Excel Stone and Tile Care