Help Help:Magic marker on real ivory

[RptBob1@AOL.COM]

Hi List:
Had a distraught customer just contact me regarding her 1 year old running a 
magic marker across about ten ivories on her gorgeous Steinway.  What have 
any of you used to remove said problem?  (it might be a "highlight" pen 
instead of magic marker).  
I  told her  I would present this "to the world"- and she was impressed (i 
hope).  Will see her piano on Friday.  Thanks in advance.

Bob Bergantino,RPT
Willoughby Hills, Ohio