I wonder how often public library keyboards are cleaned, or the ones in university computer labs. When I was in college pulling all nighters in the computer lab

I wonder how often public library keyboards are cleaned, or the ones in university computer labs. When I was in college pulling all nighters in the computer lab I regularly saw the lab being cleaned, but I can't remember ever seeing the keyboards getting dusted off, let alone wiped off with disinfectants. Go to two or three libraries in different corners of town, get what you want from the keyboards, and you should have quite the collection of DNA.