I've soaked keys in 12% Hydrogen Peroxide that I conveniently purchased at Home Depot here in the US. The soaking keys are to be put in the sun too, to facilitate the chemical reaction. I did batches of them outside for like 6-8 hours each, checking every hour or so, turning the batch to keep the sun hitting the keys without shadowing. I had to put coins on the keys to keep them submerged and made sure to move those coins around each time I checked things, to avoid shadows.
I've attacjed some pictures here that show some yellowed keys before and others that were similar looking but already treated. The keyboard clearly was kept near a window to the right, based on a general right to left gradient of bad to no yellowing and shadows of no yellowing where the sun didn't shine behind the black keys. I bought the synth in that condition, btw. I recall finding instructions on how to remove the keys on the Sequential website. It's a little tricky getting to the springs by the center case support that you can see in one picture.
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