How can I repair this?

Hi-

My husband & I just installed travertine marble floors and they are not
polished, they actually have a matte finish.  However, they have a haze on them. I'm assuming the installer did not seal the tile before he installed
it and the grout was soaked into the pourous tile.  How can I repair this? 
I read one entry that mentioned a professional floor refinisher, however, I
don't want a glossy finish.  I'd like to know if the haze can be buffed out
or if we are stuck with a dull surface on our tile.  Again, it is a matte
finish, but the haze makes it very dull and uneven.  You can actually see
"swoosh" marks that look like grout left behind from the grout tool.  Thanks
for your help.  Sabrina