I devised an odd strategy in high school that involved taking a piss without my skin coming into contact with any surfaces anywhere within the public restroom. I also included the boxer elevation technique while taking a piss, so I wasn't actually touching my dick.
Though when I think about it, my dick is probably more clean than 90% of the surfaces in any given public high school in the country.
Even if you wash your hands afterward- the amount of bacteria and germs on the door handle from people not washing their hands sort of negates the fact you just took X amount of time washing your hands.
But seriously, I see all kinds of mfkrs just walk past the sink. I always make it a habit to give them a disgusted look or laugh as they reach for the door, staring at them through the mirror like I was going to cut their throat or something. Dudes don't really approach me or talk to me in college for shit like that.