[GreenKeys] M15 cleaning bath

[greenkeys@mailman.qth.net]

I use kerosene, and you'll have to use a brush to get the icky stuff off.
I don't soak the motor.  I don't do anything special about the selector
magnet or platen; they seem to survive the soak OK.  One thing not to soak
is celluloid keytops, since the kerosene gets into the paper and discolors
it permanently.  I guess we could get creative and print new keytops on
clean paper and replace them, but that is work.