Dave

Also lithofin do a good range of cleaners........this one would be good for your project as well...

lithofin MN Power-Clean - 1L
An alkaline cleaner that dissolves and removes oil and grease marks, waxes, gloss films and residues from other floor care products and general soiling. Also for the removal of light cement films during and after grouting. For use on all marbles, polished and unpolished natural and artificial stone.