After 8 years of flawless operation my keyboard needed a cleanup. Why i did not simply buy a new keyboard? Because good ergonomic keyboards are hard to get, and microsoft, logitech and so on are crap (i tried them all).

After i opened the casing it came to me how URGENTLY it needed to be cleaned.

Remove everything.

Im a non-smoker, i dont know why its so yellowish.

First decontaminate the upperside.

Now for each key.

After cleanup and drying... looks good.
This leaves a puzzle that took me 15 minutes to solve.

And there it is. Rise and shine!