Ivoritis Elsewhere?

[Z! Reinhardt]

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Friends:

Has anyone else come to a case of ivoritis on a non-Yamaha piano?  =
Classic signs -- white keys turning greyish, but it doesn't feel sticky =
the way most grunges would.  Non-abrasives will not remove the stuff.  =
The piano in question is a Boston 218 (pretty big).

Any brilliant ideas?

Thanks in advance --
Z! Reinhardt  RPT
Ann Arbor  MI


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