I did a do it yourself cleaning, sealing and coloring with a product called Grout shield. They were able to match our original grout (which is what we wanted), and I did 30 or 40 square feet of flooring at a time. If you decide to go this route, send me a PM for some pointers.
I did all of the floors, the bathroom floors and walls, since I took my time this was a 2 week project, and i was able to move the furniture as needed. there was minimal interruption since frying time is very short.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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