We noticed that our grout was getting a little.... sludgy. Cleaning grout isn't anyone's favorite passtime. But it sure was worth the effort (which is quite a bit if you aren't prepared for it, its not like a 5 minute thing).
Our newly discovered, favorite, fantastic grout cleaner is Purple Kaboom. You spray it on, wait a while, scrub a ton, and wash it off... and KABOOM! Clean grout.
Chris even rented a carpet cleaner (Albertson's was the cheapest around here) and cleaned all our carpet. BAM! Super clean everywhere!
Wonder where our couches went? Breakfast was interesting the next morning....