...inspired by Harv's "Apple Story" post:
I have kits to clean my prehistoric floppy drive and my CD drive. I bought them when I was having trouble with a CD quite awhile ago. I do not use them regularly, and probably have not cleaned either drive in well over a year, or two! I also have a stone age internal Zip drive. I don't have anything to clean it with. (No, Harv, I'm not planning to insert the floppy disk cleaner into the Zip drive.) So, it's never been cleaned in the five years I've had the computer - well, four years: I have the orginal Zip drive in a drawer.
So, how often do you do it?
P.S. To those who thought this topic should have had the "OT" prefix, sorry; you were wrong!