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Posted 30 January 2019 - 18:25
Posted 30 January 2019 - 18:45
This key cleaning product can be found at
However it may not be able to do anything about discolouring. There is a Piano Advice forum attached to the website above and you could try asking the question there.
Posted 30 January 2019 - 19:04
Posted 30 January 2019 - 20:01
Also found this thread which may or may not be useful.
Posted 30 January 2019 - 23:55
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