Usually, you only need to clean your bathroom tiles once a week with household detergent. If the tiles are really dirty, you need:

• Swab the tiles with detergent and leave it overnight
• Moisten the tiles with water and sprinkle with the scouring powder or a harsher abrasive
• Use a scrubbing brush to clean the tiles and grout
• Rinse the tiles with clean water
• Dry the tiles with a clean soft cloth to make them shine and to prevent limescale forming