If your ceramic tile is unglazed, you may need to clean it with a special cleaner. Follow these steps:

  1. Wet the tile with water and pour in a small amount of mild dishwashing soap.
  2. Rub the soap around the surface of the tile, using circular motions.
  3. Rinse the tile with water and dry it off.
  4. Apply a coat of sealant to the surface of the tile if desired. ..