Piano Pages
What can I clean the keys with?
Use just a damp (not wet) cloth, but if this is not sufficient try a little lemon juice. For worse cases ask your piano tuner for some key cleaning fluid.
Do not use household or kitchen cleaners with chemicals and abrasive powders.
The white keys may be:
Ivory
Pyrolin
Thermoplastic
Cellulose
Imitation ivory
Imitation ivory is grained (like wood), like cheaper ivory. Real ivory of the best quality does not have readily visible graining.
The raised keys may be:
Ebony
Ebonised wood
Plastic
Bakelite
Other material
Take care not to splash liquid between the keys.