Cleaning Ceramic Tiles: Unglazed
With no protective layer of glass, unglazed tiles are more difficult to clean. First, their porous surface traps grime much better than their glazed counterparts, and they aren’t nearly as resistant to stains. Second, the vulnerability of the naked clay limits the strength and type of cleaner that can be used. The answer is to use a strong but neutral-pH cleaner.
Additionally, if you find yourself cleaning ceramic tiles often, consider having them sealed. This will increase the durability and stain-resistance of the tiles, though won’t remove the need for regular cleaning altogether. Tiles should also be resealed periodically, around once or twice a year.
How to Clean Ceramic Tile: Grout
Grout holds your ceramic tiles together but unfortunately holds moisture, stains, and dirt extremely well too. Even if you clean your tiles well, your initially pristine, white grouting can quickly become grey and dingy.
If it isn’t already, the first thing to do is get your grout sealed. (Tile-layers will often seal tile and grout at once.) Make sure to avoid a silicone seal that extends over the tile surface itself – this can ruin the glossy finish and will often wear off in patches.
If your grout is already dirty, all is not lost – grout staining products are available from most DIY or home maintenance stores, and these can help to restore some of the original colour.