Water Rings on a Marble Table: What They Are and How to Remove Them
The ring left by a glass is rarely water damage. It is usually what was in the glass.
How to Fix Etch Marks and Dull Spots on Marble
You cannot clean an etch away. You can polish it out.
What Not to Use on Marble (And What Happens If You Do)
Most of the products people reach for are the ones that cause the damage they are trying to clean.