I have an odd ritual when I come on duty. First, I wash my hands. Then I wipe down my workstation with Sani-Wipes - this includes the telephone, keyboard, chair, call-light speaker, and the soap dispenser. Finally, I place a folded bath-towel on the chair so my butt won't be touching the leather seat itself.
Odd yes - But we all have our own methods for being control freaks - My own is just the avoidance of germs.