Grout haze on Travertine

You have answered many of my questions in the past in forums, so I thought I would ask for some help. First thanks for answering my questions and helping me out.

I have laid travertine in my basment bar\kitchen area and I grouted a couple days ago. I guess I didn't get all of the haze off and now you can see it big time and it doesn't look good. What is the best way to remove it? Can I buff it? I was getting it wet and using a 4" putty to scrape, but it is time consuming and causes some minor scratching. Any ideas?

First pic is what it looked like pre grout. Second pic is grout in and floor wet so you can really see the haze but there is definitely a somewhat thick haze on the tiles.

Thanks!