Preventing CROSS CONTAMINATION is hard enough even with a paper towel.
Most large shopping stores have gone to the blower concept to save the expense of paper towels,
whereas, in fact, the blower system actually aerates the germs spreading and dispersing them though out the room.
Hand blowers should be considered a HAZMAT incident - choose paper towels -
If paper towels are not available, complain to the management !
The new blowers seem to be more sanitary, as you put your hands inside and the blowing air is contained. Of course, you still have the issue of opening the door out of the restroom. If the door opens out, you can just push your shoulder against it. If it opens out, different story, and no paper towels available...