pressure bar powder

[Doug Garman]

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>From time to time I open an upright and find the pressure bar and screws =
coated with a light yellow-green powder.  What is this?  Oxidation?  How =
should I clean this off, or should I?  Saw one yesterday on a Wurlitzer =
spinet (2-pedal).

Thanks --- Doug Garman  :o)



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