Clean tile and grout can add a dramatic flair to any home. Couple this with a long life span and great resiliency and it's no wonder tile has come back into fashion. However, professional cleaning is still important.
Due to the porous nature of grout, it tends to absorb mop water. If this water is dirty, you will begin to notice dark grout lines. Also, most consumer cleaning agents will leave a film on the surface of the tile. This film will attract dirt, making it get dirty more quickly.
Desert Dry uses top of the line cleaning agents to loosen up the dirt and grease, and to break down the residue left by most consumer cleaners. In severe situations Desert Dry will scrub the grout and tile with 
a floor machine, this agitation . Finally a high pressure rinse is used to remove the foriegn materials from your tile and grout. Results often times are simply amazing.
It is important to have your tile and grout cleaned on a regular basis. Think of it as maintenance. Then you can rest easy knowing that your ivnestment will look great for a long time to come.
After the profesional cleaning. I suggest cleaning with a neutral Ph. cleaning agent. This will help to keep the soapy film at a minimum, and your tile will continue to look great.