Scruffy people about....
Back in the early 2000s, the IT department of which I was part regularly had to replace the keyboard of someone I'll call Terry.
Terry had a devastating habit of eating French stick chicken salad and sweetcorn at his desk. This contributed far too regularly to keys not registering and this was sometimes down to
1. Mayo gumming up the mechanisms
2. Crust getting between keycap and keyboard plate
3. Sweetcorn getting UNDER and inside the keycap.
For some time the keyboards were being replace at 3 month intervals.
Eventually. we stopped doing it. because....
... Terry was spotted in the loo taking a No1 or No2 and exiting WITHOUT washing his hands.
Once you see that, you question every bit of stickiness, and keyboard discolouration. You also give yourself a good scrub down not unlike Chernobyl...
Eventually senior management banned him from having an office supplied keyboard, and also from eating at desk.