Yes-iron out may work-do you have a picture-
Acids will eat rust but you have to be careful what acids you use-all acids have different properties and effects on materials.
You can mix certain acids to take advantage of those properties-consult a chemist before you do-

On Thu, May 12, 2016 at 8:11 PM, Ron Moore <rmoore@americanstonecare.com> wrote:

Mix iron out with your poultice. Works great

Ron

On May 12, 2016 8:05 PM, "Justin Cameron" <justin@jmcstoneandtilecare.com> wrote:
What's a good poultice to use to remove rust stain on White Ice granite.
Thank you
Justin

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