I worked for an organisation where I had to provide unofficial IT support. One of the secretaries (it was some time ago) complained that her much loved keyboard wasn't working properly anymore...
Me: "How long have you been using it?"
She: "About 5 years."
Me: "Have you ever cleaned it?"
She: "No, I didn't know you could."
It wasn't just a matter of turning it upside down and banging it on the desk (although that was mildly horrifying). All the keys had to be taken off to get at the thick padding of dead hair, skin and food debris that was stopping them depressing far enough to work. It was alive I tell you, alive!