I got this info off of a Maserati forum that I am a member of.
"Of the products that I use : either warm damp cloth for cleaning (you need no more) or Lexol when I need to lift-up ingrained dirt (also Gliptone products are known to be a treat, but have not used them myself.) For conditioning I have used Croftgate leather cream, Autoglym leather cream and/or Lexol conditioner, which are all water-based.
After experimentation, I am getting inclined for the Lexol combo, which is great as a one-stop shop solution."
Hope it helps.