Best Grout Refinishing in Phoenix AZ

We had finished our floors using sealer from Lowe's or Home Depot (we didn't know how terrible this would be).  The floors looked okay. A year or two later, we hired someone to clean the floors.  The previous gloss/sealer turned into little glue balls all over the floor and our Saltillo was ruined. The other people came out 4 more times to try to fix it but nothing worked.  We hired Mexican Tile Restoration in early 2014 (we checked several references they gave us which were glowing).  Well, I understand the glowing recommendations!  Our Saltillo floor didn't look this good when we moved into the house 12 years ago.  The floors looked brand new.  They also gave us tips for maintaining the floor.  It's about 1.5 years later and our floors still look incredible.