Use some isopropyl alcohol to clean it and you don’t have to worry about anything getting wet and shorting. IPA is really good at removing the greasy smudges from the things we fondle.
but the grease is the evidence of it’s use….
years from now, archeologists will be able to extract DNA from the keyboard… to discern what kind of things i was eating when i dropped crumbs and residue….
spores from local mycelia will still be viable….

yeah i’ll clean it and take another picture