key discoloration

[Diane Hofstetter]

I just had to get bad yellow out of the plastic keytops of a rental piano.  
Of course, it took me almost to the end of the job to figure out how to do 
it easily and
well  :-(

Simply swish on a lot of acetone with a chip brush until it is nice and soft 
using the brush to clean off the top yellow layers, then wipe with a fine 
grained (?!) rag soaked in the acetone until it is smooth.  Beautifully 
white.  Too bad I spent several hours before I figured that out!

However, if I were  doing the job for a customer, I fully agree with Roger, 
et.al. who say to replace them.

Diane
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