Same here. I decided years ago that I would simply not touch my face ever, except at home after washing my hands well. Now it's second nature. Don't even have to think about it.
On top of that, besides the paper towels on door handles (and not just public lavs, but all doors) I also never touch a pen that is used by the public. I use my own pen, or if it's one of those set-ups for credit card that you have to sign with the attached stylus, then that also gets the kleenex/paper towel protection too.
Somebody mentioned Monk earlier -- he hasn't done anything I don't see myself doing! Well, maybe the boiling water on the toothbrush, I haven't gotten to that point.
NAHHH!!! You run your family toothbrushes and your kitchen sponges through the dishwasher, separately of course if you are really "Monk" ee ! One hundred and forty degree water ought to do the trick! Although when small ones are sick, I do boil the teakettle and pour it over the brush! Get rid of those gross cups that everyone's saliva drips into after brushing and you'll be a happy Camper!
Did I say Paranoid?
"Somebody mentioned Monk earlier -- he hasn't done anything I don't see myself doing!"
Lol. I do a lot of Monk things, too.