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Old 05-23-2013, 07:08 PM
rlitman rlitman is online now
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Join Date: Sep 2009
Location: Long Island
Posts: 1,101
You need an acid cleaner to get rid of the rust stains, but any acid will etch limestone.
I would suggest you find an oxalic acid cleaner (often labeled "wood bleach"). Oxalic acid will be milder on the limestone than other acids, but attacks rust by turning it into a water soluble CLEAR chemical (iron oxalate) that will wash off.
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