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Do not use any ammonia, vinegar, or lemon cleaners, as their acidic formulas will eat away at the graniteŐs surface!
Water based stains - Mineral deposits from sprinkler systems.
Mix 1 cup of baking soda, 5 tablespoons (73.9 ml) of liquid dish soap, and enough hydrogen peroxide to give the mixture the consistency of yogurt.
Coat the stains on the granite headstone with the poultice. Cover the poultice with plastic wrap and tape the edges down with masking tape.
Let the mixture stand for at least a day before wiping it off.
Once you have wiped off the poultice, wash the areas where the poultice was applied thoroughly with clean water.
Once you are confident that there isnŐt any residue, use a new and dry white cloth to buff the granite and remove any streaks.
If the stain remains, (e.g. hard-water strains), you may need to repeat the steps above several times.
Each time you do so will result in removing more of the stain.Source: How to Clean a Headstone: The Ultimate Guide | Love Lives On
How to Clean a Headstone: The Ultimate Guide | Love Lives On
How to Clean a Gravestone: 12 Steps (with Pictures) - wikiHow