I have over 2200 sq ft of off white tile and very light gout. I had it sealed when it was put down and use a commercial cleaner yearly on the gout, then re-seal. I have a Hoover floor mate and like it, but I do get strikes once in awhile. I use the liquid cleaner that you purchases for the Hoover floor mate, then about every 3 months, I rinse with vinegar & water and a string mop. I also have the Shark steamer that I use on the smaller bathrooms, but I don't like it on larger areas. Seems it doesn't put enough steam out to get things really clean.
I find getting down on my hands and knee cleaning grouts is still better than what I have to do to the wood floors.