[walshemj]

I was told that if your work in a chemical plant or a chip fab you learn to wash your hands before you don't want chemicals on sensitive parts

And of course you don't know what germs etc are on the taps :-)

[TomMarius]

You usually use gloves though

[walshemj]

Yes so there is nothing wrong with an extra layer :-) ask any medical practitioner why the put gloves on after they wash their hands.