How to make dull marble tile shine?
Here are a few ideas you might try Cathy
Marble is basically compressed limestone. Any acidic cleaners will etch, dull and stain the surface, including vinegar, citrus cleaners, lime/calcium cleaners, and bleach.
Clean and brighten your grout with this easy homemade grout cleaner. Simply mix baking soda and hydrogen peroxide into a runny paste and scrub with a toothbrush. Let the mixture sit for a few minutes and then rinse it off.
If you are trying to remove an old stain, create a dense paste of more baking soda and less water. Then place the paste over the stain, allowing it to function for a few minutes. After that wipe off the baking soda paste. If it is needed you can repeat the procedure until the stain vanishes.
If the stain is persistent and is still there you can try removing it with ammonia solution. Make the area of the stain damp with 10% ammonia, diluted in water. Ammonia is knows as a base solution, so it is suitable for removing stains from marble.
The final stage of the stain removal us rinsing. Rinse the solution from your marble well to eliminate any residue, left from the cleaning ingredients on it.
I advise to use gloves when removing the stain with ammonia. They will protect your hands. Ventilate the room, in which you use ammonia for removing stains, because it is toxic.
Marble what? floor, counter, shower?
That needs to be done by professionals. It is very time consuming process that requires buffing tools