Spilled coke on the plate

[Piannerman@aol.com]

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Dear People,
      Someone spilled a coke years ago on this Yamaha GH1 Grand and the spill 
is now a 12" diameter hard scratchy stain on the plate.  It looks and feels 
like that the undercoat they used to spray underneath autos to keep the fenders 
from rusting out.  If you are over 40 you know what I mean.  Has anyone else 
ever had to clean up this kind of a mess?
     I am thinking about removing the strings and pins of the affected area 
to clean.  But what would be a good cleansing agent?  Vinegar and water?  Or 
maybe some kind of paint thinner?  Please help, I'm flying blind here.  I don't 
know yet what damage, if any, it did to the pinblock.  But right now I would 
be happy if I had some kind of solution to the cleaning problem.  Literally and 
figuratively.
     Thanks a bunch for any help.
Charles Cron
Rockfield, KY

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