I remember having a couple of waterproof pc keyboards. You could actually disconnect them then wash them under a running tap. Just keep the usb connector dry. Took ages to dry out before you could reconnect though.
The ones I use now are the sort that are pseudo mechanical, with pretty lights, so they click as you type, and each keytop is removable. There is a switch under each key, not a membrane. More usefully there is space around each key so flipping and shaking gets rid of most bits that fall in. ( Like sunflower seed shells from my overactive lovebirds )
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