keyboard plaque
n. The dirt, dust, and other grime that accumulates on computer keyboards.
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 05, 1998
1995 (earliest)
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 01, 1995
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