I still don't know what you've got there. What is sealed ceramic tile? Do you mean ceramic tile that you have applied a sealer on the grout? Do you mean glazed? Do you have any specific info on the tiles?
How long ago was this installed? Any idea which method of installation and specific type grout? What problems are you having? What color is the grout?
Are the tiles hard to clean too? What are you using to clean and how often? How many people, pets, paved streets, sidewalks, attached garage? Where is the house located?