I’d bet you anything that someone, somewhere, sells cloth mouse covers. And they can probably be machine washed.
And if someone hasn’t come up with it already, well, there’s your million dollar idea. Find yourself a seamstress and a marketing expert and Bob’s your uncle.
Really? I just now tried covering my mouse with a tissue. It worked just fine. Using the scroll wheel was a little difficult, but would have been easy if I cut a hole in the tissue.
Have you tried to periodically wipe your mouse down?