Picture is pre-retrobrite and cleaning.
Pics not for the faint of heart!
Two Amiga keyboards came with the 2000 system I picked up via Craigslist. And the fun part is, full of bug carcasses and a few living worms.
Fully disassembled each keyboard. All keycaps soaked and washed. All the little rubber sping things were washed. Plastic part disassembled from metal backing, everything cleaned out. Space bar was not working on one but after cleaning it was back.
After everything was scrubbed and washed, the last step was to retrobrite the yellow away. Sally Beauty Supply #40 cremed it. There is some banding and you can see brush stroked under bright light, but better than it was!