Hello, I just noticed on the piano I was tuning today that the metal screws are covered with white powdery residue. Is this aluminum oxide and do the screws need replacing or can this be cleaned off? Thanks Zoe -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100121/c579a23e/attachment.htm>
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