Of course you could hire a well known big business to come to your home with their expensive machinery and be in and out in a quick manner; and charge you and outrageous price! If you are not worried about money then this may be your best option.
Then there is the Coole Cleaners way! It may be old fashioned to get down on your hands and knees, but we do not use expensive equiptment. We use a bleach based product, a grout bristle brush and a little elbow grease. It successfully leaves your grout looking like new, and the price is half of the big business prices!