CP contamination on Yamaha S 400-B

[Mark Dierauf]

Joe Goss wrote:

Is there any discoloration on the flange parts? It sounds like someone =
has used the graphite with an oil carrier to lube the center pins.
You might try removing the hammers and washing out the gunk.

Joe -
  There is a small amount of discoloration on the flange, and now that I
think of it, it seems to run along the grain of the wood. Have you had long
lasting results from washing? How aboat Naptha for a washing agent?

Thanks,

Mark Dierauf