Black granite makes a strong design statement in any kitchen or bath---unless they are covered with dirt, grime and fingerprints. The key to keeping granite clean and stain-free is to clean spills immediately before they have a chance to set in. Granites that are dark in colour require a little extra attention to maintain their shiny finish, since they more easily show traces of dust and fingerprints. Luckily, the perfect method for cleaning black granite is easy and inexpensive.
Fill a spray bottle with distilled water (regular tap water may contain chlorine and other minerals that can leave behind a dull film) and spritz the granite. For especially dirty surfaces, add a few drops of mild dish soap.
Wipe with microfiber cloth until clean and dry. Don't use this cloth for anything other than cleaning granite. Repeat over entire surface as needed.
Buff to a glossy finish using the dry chamois cloth. Again, use this chamois only for your granite.
Repeat these steps daily to maintain a clean, streak-free finish.
For more stubborn stains, try a cleaner made especially for granite. Test all cleaners on a small, hidden area to make sure they won't damage the finish. All granite needs to be resealed every two years or so to maintain its appearance and durability.
Never use harsh or abrasive cleaners, including vinegar or lemon, on granite.