Crema Marfil is a very delicate and elegant marble not ideal for kitchen use due to its calcareous nature, or chalky characteristic. It can easily be damaged by acids, causing unwanted and probably permanent and irreversible etchings. It also is highly porous, so staining is very common.
If you find that the marble surface you cleaned a few days ago has discolored, you could try this to get back the shine. First, check to see whether the discoloration is rough and dull. Then check all the grout and caulk lines to check for any water seepage. The discoloration might be a form of efflorescence.