Back in college (90's) we had a professor who, about once a year, would send an email to help desk saying his monitor had gotten blurry and he needed a new one.

Back in college (90's) we had a professor who, about once a year, would send an email to help desk saying his monitor had gotten blurry and he needed a new one. We'd go to his office, wipe off the thick layer of dust and it'd be as good as new again.