Howard Hughes Washable Computer Mouse

Long story short: A plastic sheath separates the magnetic scroll wheel from the internal magnetic components: remove the wheel and wash your mouse.

From the website:

M10 ScrollSeal Washable Optical Mouse

The UNOTRON ScrollSeal Washable Optical Mouse uses patented SpillSeal® Technology and has been tested to the international standards of IP66 and Nema4X.

The M10 ScrollSeal Washable Optical Mouse is a 3–button mouse and is the first washable mouse to incorporate a removable scroll wheel.

It has smooth optical tracking, ergonomic design and features two standard buttons with a third button conveniently located in the centre.

The innovative design of the mouse means that it can be easily washed/immersed and sterilised with most detergents and anti-bacterial agents.

Every recess can be sterilised including the scroll wheel which can be easily removed and simply clipped back into place once clean.

UNOTRON M10 ScrollSeal Washable Optical Mouse fulfils the hygiene demands of many applications: Healthcare, Government, Education, Financial.

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Huh — I hadn't realized before I read the website copy that there were "hygiene demands" in anesthesiology beyond washing my hands; I guess I better keep an eye on this space, what?

Unotron also makes two other versions of washable mice, the M20 (below)

and M30 (below),

both of which are somewhat more expensive than the entry–level M10 and apparently able to withstand being cleaned/sterilized with more powerful industrial–strength detergents and whatnot.

The M10, in black or gray, is $49.99.

The M20 costs $55.06.

The M30 runs $68.99.