I am the new owner of a 1926 Gulbransen Upright Player.  The previous
owner was attempting to teach their children how to play and put
stickers on the keys with the letter notes.  I removed the stickers
but the sticky remains.  Alcohol was not the solution, sudsy ammonia
on a Q-tip seems to work but what's the best way to clean them.  They
are made of celluloid.

Doug Anderson