Define "cleaning"
At around the same time, I was the engineering buyer for a factory that produced various liquid and powdered products. Occasionally, we'd have visits from prospective customers, who came in for a tour of our state of the art, automated production facilities.
Naturally, some of the production areas could get quite dirty, so the customer visits were always proceeded by a big clean up around the factory. One such day, a recently employed production assistant was tasked with cleaning up the office areas, including the process control booths.
Noticing the state of many of the keyboards attached to the various DEC VT100 terminals (I did say it was MANY years ago), she decided they'd all benefit from a good scrub and proceeded to do just that in the sink in the factory break room.
A couple of frantic phone calls, and several called in favours later, we had a taxi full of replacement keyboards on the way from the local DEC distribution centre. I forget the final bill for the episode, but it was well into four figures, not counting lost production time.