Mop
For everyday cleaning, use warm water and a mop or microfibre cloth. Every few weeks, or when necessary, clean with a mild detergent mixed in warm water.
For regular cleaning, be sure to avoid chemical cleaners that contain ammonia, bleach or acids. You should only consider chemicals to remove any stubborn stains. Using corrosive chemicals regularly can lead to the erosion of the surface of the tiles, whilst also increasing their absorption rate. This would ultimately mean they got dirtier quicker. Chemicals can also erode the grout over time, which can lead to loosening of tiles and allow water to breach the underside of the tiles.
When using a detergent, you should ensure it is of a low concentration. If your tiles are a textured porcelain, they may need a slightly higher concentration.