Cleaning the keys was next. I simply ran them through an ultrasonic cleaner for a few minutes, rinsed, then immersed in silver dip to remove the built-up tarnish. This cleaning process is the reason I had to separate all the steel screws from the silver keys before cleaning, as the chemicals in the ultrasonic and the silver dip cause steel to rust very badly within a few hours of exposure. The keys came out great!
Actually, in the right side of that picture you can see one steel rod that's pinned to its key (the C# touchpiece) and the little bit of rust that started to form after it was cleaned. Fortunately, that will come off.
Here's another shot of what they looked like pre-cleaning, as a comparison (though this one was taken without flash, d'oh!)
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