
The only problem with your old terracotta tiles may be that they show signs of efflorescence where white salt deposits form on the surface of the tiles.
These can be removed with a specialist product such as Cement, Mortar & Efflorescence Remover by HG Hagesan. Make sure you wear gloves, and safety goggles, as well as an odour respirator, and follow the manufacturer’s instructions.

Photo: sarahandiain, via flickr
Or, maybe your tiles haven't been sealed? Terracotta tiles are porous, so they get marked easily if they aren’t sealed. Old tiles may never have been sealed, and will need thorough cleaning before you seal them. Previously sealed tiles may also have become dirty and marked over time.
To get them looking their best, use a proprietary cleaner such as Wax-Off by Lithofin or Pro-Cleaner by Tile Doctor. Test the product on an inconspicuous area before you tackle the rest of the tiles.

Rinse the cleaning product off thoroughly with clean water. Allow to dry thoroughly. Seal porous terracotta to prevent future stains and marks. Lithofin, HG Hagesan and Tile Doctor offer sealing products for terracotta.
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