keyboard plaque
(KEE.bohrd plak) n. The dirt, dust, and other grime that accumulates on computer keyboards.

Example Citation:
Some of CompuClean's customers even turn to them for other services above and beyond the level of keyboard plaque, even though cleaning remains the primary service.
—Peter Wilson, "Company finds niche in 'keyboard plaque'," The Vancouver Sun, June 5, 1998

Earliest Citation:
Keyboard Plaque: The disgusting buildup of dirt and crud found on computer keyboards. "Are there any other terminals I can use? This one has a bad case of keyboard plaque."
—Gareth Branwyn, "Jargon Watch," Wired, June, 1995

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