Clear the tile floor by removing any items such as wastebaskets or tables and chairs. You do not have to move large appliances but keep in mind that you will only be able to clean the grout where the floor is exposed.
Sweep and mop the floor to remove as much dirt as possible before you begin steam cleaning.
Fill the steam cleaner according to the directions for the particular brand of cleaner you are using. Most steam cleaners use a mixture of water and detergent. If you are renting the cleaner, you should be able to purchase the required detergent from the same store.
Turn the steam cleaner on and begin cleaning in one corner of the room. For handheld steam cleaners, direct the nozzle of the cleaner at the grout to remove dirt and stains. Upright steam cleaners, which resemble vacuum cleaners, are pushed back and forth across the floor in the same manner you would vacuum carpet.
Clean a small section of the floor at a time and wipe the grout immediately with a clean towel if dirt persists. The dirt should come off easily after the grout has been steamed.
Continue to steam clean the entire tile floor. Stay off of the floor for at least two to three hours after you finish cleaning to allow the floor to dry completely. If the grout is still damp after a few hours, wipe the grout dry with a towel before you begin sealing.
Apply a sealer to the grout when it is completely dry. This will help protect the grout from spills and dirt and make future cleaning easier. Grout sealers are available at flooring and home improvement stores and often have an applicator attached to the bottle for your convenience. If the bottle does not include an applicator, use a small paint brush to apply the sealer directly to the grout.