This video shows a small sample of the cleaning power in Chem-Dry of Tampa FL's tile cleaning service. Using Chem-Dry's patented tile cleaning solution and a high pressure washing spinner the grout between the tiles get dislodged and removed. The results in the video speak for themselves.
In most cases home owners don't know how to properly clean their tile floor. Mop and bucket cleaning is the preferred method of most home owners. It's also the least effective way to clean tile floors. In most cases it just distributes the dirt more evenly. It can even add more soil to the grout. The failure of mop and bucket cleaning is how dirty the cleaning solution gets and the lack of absorption of the mop head. You just end up pushing the dirt around.
You're better off spraying the floor with a light cleaning solution and then drying it with a mircofiber pad. You can also use a hard surface steamer but they usually don't push enough steam to get the tile clean enough. I like the Rubbermaid Reveal hard surface cleaner for tile cleaning between professional cleanings.
At Chem-Dry of Tampa FL we follow up our tile cleanings with a penetrating grout sealant to protect the grout from future soiling and staining. Our grout sealant is an invisible barrier that protects the grout from the inside. Your grout will stay clean for three times longer and release soils much easier.