I don't, My desk causally is piled with papers, programming printouts, PCB's with defects to be resolved, and spare/broken parts from the SMT machines.
For me its more important to help the SMT department and SMT Inspection department get better organized or 5S than it is for me to attempt to keep my desk 5S.
5S the most bang for your buck, its usually takes a decent time investment, mitaswell do it in a location that gives the largest time and quality return.
Now the SMT tool chest, the SMT work table and the other areas in my departments are either 5S or working toward 5s.
SMT & Inspection lead