Your Apple Extended Keyboard II, M3501 (Mitsumi switches) are compatible in the dishwasher, provided that you:
- Do NOT wash the printed circuit board
- Do NOT run a 'heated drying cycle'
- Put your keycaps in a closable accessory bin (Usually on the silverware seperator)
- Try and wash the front and rear bezel on the top rack.
These instructions apply to *my* dishwasher. YMMV.
Yours,
Perry
Yes, I washed a couple Mitsumi Amiga keyboards in the dishwasher a few years ago. I didn't even have to take off the keycaps. The whole assembly comes off the circuit board in one piece. It was the easiest keyboard cleaning I ever did.
chiclet 2006 are the best among all the DW buttons available on the market. Not much tactile but nice landing feeling.
Chiclet FTW
I like the tactile metal ones. Like always, vintage is best:

(not my dishwasher - I found it on a washer forum... can't
believe there's a washer forum)