I moved your thread to the Advice Board where it will get more attention.
Start out with 10% vinegar and water. Wet the area and let it sit for 10 minutes, then scrub with a stiff bristle brush. Rinse thououghly, then dry. If necessary, repeat with stronger concentrations (up to 50%). You may have to go with a stronger acid, shich you will find at your tile supplier. Be carefull, it is acid, after all. Don't forget to rinse thoroughly, since the acid can attack the grout and thinset.
If the tiles were simi-gloss, they will return to that condition after the haze is gone. You have only to seal the grout, which you can do with out grout sealer. Check out our on-line store. Wipe the entire surface, then buff the sealer off the tile surfaces.