I use a Shark on the hardwood floors and spray a fine mist of windex as I go. And I follow up with a mop that has a terry towel cloth attached to the bottom of the mop to get rid of the streaks - sometimes dampening the cloth. On my tile I use the Shark too and every 4 months I get down on my hands and knees and paint the grout with a dark grey cement paint. It looks so new and so clean.
