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Hi All, We have stone countertops in the kitchen. Pietra Cardosa specifically or, as our plain-speaking GC likes to call it, “grey schist.” It performs very well but, after 9 years use, has darkened significantly. I believe this is due to its having absorbed cooking oil etc. So before I reseal it, I’d like to thoroughly clean it. Has anyone tried applying a poultice and, if so, do you have a recipe for mixing it up? Any other tips gratefully received. I’d rather do this myself than hire a professional but don’t want to use the wrong chemicals!