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Old 05-24-2013, 04:20 AM
greendoctor greendoctor is online now
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Join Date: Mar 2008
Location: Honolulu, Hawaii
Posts: 8,311
Oxalic acid will work on concrete and stone. It is much better than muriatic acid. No fuming and way less etching. Plants and grass take it far better as well.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775

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Benjamin Franklin Poor Richard's Almanac1738
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