Most of our products can be used on a black granite headstone or a granite headstone of any color just like on a granite countertop. So, it just depends on what you'd like to do.
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If the headstone is in good shape and basically clean, then use the Stone Care: Granite & Marble Cleaning Spray (1 QT) for general cleaning.
If it has moss on it or mold and mildew, then use the Stone Care: Mold & Mildew Stain Remover (1 QT).
If the headstone is really dirty and grimy, then you'll want a more intensive cleaner like the Stone Care: Heavy Duty Tile & Grout Cleaner (1 QT).
And if after cleaning, you want to make it really shiny and provide a little extra protection, use the Stone Care: Topical Granite & Marble Polish (1 QT).