Marble lost shine

[Szgany]

I have had a marble floor in the kitchen area for one year now. The shine that was there originally was lovely but now it is dull.

How and what do I use to get that shine back?

I've tried different methods and cleaners but none work. I've also tried with just plain water over and over again.

BTW It is Chinese marble if that helps.

Thanks in advance

[village idiot]

go to this site & follow the link to sealants & cleaners
mudster can give further info if required