This video, presented by Great Lakes Granite & Marble in Redford, Mich., is a useful look at the steps of stain removal from granite and stone countertops using a poultice. The video lists what types of poultice to use on what type of stain; tells what to make a poultice out of, and then walks through the steps, from mixing to the final process, to remove a stain.
While I’m not sure it is the best idea for a homeowner to try this, certainly any granite fabricator should probably understand the process and be able to perform it, should the need arise.
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