Poultices for cleaning limestone

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I am researching poultices for use in cleaning limestone faced
buildings.  The stains to be removed include corrosion stains,
burned/scorched stone, and stains from roadway salt penetrating the
stone.  I'm familiar with several manufacturers of detergents and
other cleaning systems, but I've found very little on poultices.
Please pass along any tried and true poultice recipes or information
about where to find them.

John Russick
Preservation Designer
Architrave P.C. Architects
420 10th Street, SE
Washington, DC 20003

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                  Conservation DistList Instance 11:95
                   Distributed: Friday, May 22, 1998
                       Message Id: cdl-11-95-015
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