A ceramic tile floor is very durable. When cared for, the tiles will last for many years. Generally speaking, all you need to do to clean it is to sweep it daily and use a damp mop to wash it.
For stubborn dirt or stains, a couple of drops of soap in mop water will be sufficient. If the tile or grout is white, you can add a bit of bleach to the mop water. This will remove yellowing and stains.
Is Bleach Necessary?
Bleach is not needed in routine cleaning of ceramic tile, and is actually a bit of overkill. Use it only for bad stains and yellow grout.
WARNING: Bleach stains clothing and is toxic to inhale, so be sure to wear old clothing and gloves and check your work area has proper ventilation before you use it. If you're going to have your face close to the bleach while you work (which often happens when leaning down to clean floors), then wear a face mask and safety glasses. This is especially important if you have a history of respiratory problems.