I had an extremely grungy keyboard, lots of crumbs, hair, food, etc. I set it out in the driveway and cleaned it with a pressure washer. It was sparkly when I was done. Let it dry in the sun for a day and it was fully functional.
I've heard of people cleaning then in the top rack of a dishwasher as well. Not sure I'd try either of these with a really high-end keyboard, but ymmv.
Mastodon is well past that and is a extremely viable platform. It was def like that during the initial Twitter exodus though; people were bitter
The "leather" made from cork is pretty amazing.