Litter box soundboard

[Jim Johnson]

 I have a customer with a Kawai grand which has apparently been used as a 
litter box.  I'm looking for suggestions for removing stains from the 
soundboard without further damaging the strings with cleaning liquids.  I 
have cleaned it using dry methods but it still looks gross.  Attached is a 
photo of the problem. Any help will be greatly appreciated. You can see the mess is you go to the following link.

http://www.pbase.com/jhjpiano/image/76413280



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