What type of cleaner should i use on a marble floor that won't damage it?

NEVER put an acid like vinegar or wine or even tomato juice on your marble surfaces. Marble is very porous and can react badly with acids. It is much softer than granite. For your marble floor, first use a stone sealer on it to seal it well. Then use a non abrasive floor cleaner to clean the floor. It should also be neutral pH. At places where you can get the stone sealer you may also find stone cleaner. Those are really nice for cleaning marble.  more