Absolute black honed granite countertops

We had granite countertops installed two years ago.  After installation
  the company applied three coats of mineral oil and then sealed it with
Mira seal.  The counters always have an oily film on them that will not
clean off.  I have cleaned them with acetone  which does clean them but
after using them for a while I have the same problem.  I was wondering
if I should use a stronger stripper and if so what do I do with the
counters after they have been stripped.  I would appreciate any advice
you could give me.