Ekserb said:No.
I assume that the street bum was drying his sweaty mop of hair with the inverted nozzle and really hadn't washed his hands at all. He just walked up to the dryer and flipped the port with the same hands he just used to wipe his ass after the roll of toilet paper ejected its last square. There's a colony of E. coli living on that nozzle and I don't want to be anywhere near it.
This is the same reason I first pump the paper towel holder a few times when I enter a public restroom. I want the very last thing I touch to be the only thing that wasn't touched by anyone else. I'll pre-load the dispenser with about four or five jerks of the handle, then do my business and wash up, leaving the water running. I tear off the clean sheets and dry my hands, use the towel to turn off the faucet, then pull the door handle with the dirty towels and toss the ball into the trash as I walk out the door.
Why go to the trouble? Because the last dirty fuck that walked out of that room probably didn't wash his hands and the las thing he touched before his fingers gripped the door handle was his filthy fucking cock or ass.
Actually, the door handle is the cleanest thing in a public bathroom. And I use the air blowers to dry my hair all the time in my gym locker room. Beats having to pack a blow dryer every time I go.

They are great on anything.....