Revive dull marble

Q.Hello, A contractor installed 200 sqf of marble on the floor. It was looking great and shiny. After grouting, I noticed there were lots of areas that didn't shine because of grout haze and also thick grout on the tile on other spots. I had good success in taking the grout streaks off simply by scrubbing it off with water and towel and also with little bit of very careful scrubing with grout line knife (without scratching the marble). Given the size and the manual effort, I couldn't imagine doing that on all the area especially areas with visible grout on the surface. I rented a machine and used the "black" pad as suggested by the sales person. When I used it, it took the grout out BUT it also dulled my marble surface and it doesn't shine anymore!!!!! Luckily I used it in a small area and not all the floor! I later learned that the black pad is VERY abrasive and I'm not sure what's the extent of the damage of the floor. I'm really mad and sad at the same time as this is a brand new floor. The simple question is, is there a way to get the marble to shine again? The area damaged is 12 sqf on one side and another about 35 sqf. I'm putting a hottub exactly on top of the 35 sqf area so it won't be visible (though I'd love to refinish it before the tub goes but not sure how much time I have before it's delivered). I'm hoping I can do the 12' area myself if it's not too complicated a process.

A.Hello Ahab,  To repolish that marble you will need a heavy floor machine and lots of equipment.

For goodness sake call a bona fide stone refinisher and get the floor cleaned and repolish correctly so you can enjoy it.

Sounds like you had a tile guy install your stone.It would guess you used sanded grout as well. Please call a pro.

You can find one at www.stoneandtilepros.com

Stu Rosen