While I was in nursing school
a graduate from the year before came to speak to us. She was currently working in a doctor's office. She said that a girl about 18 came in and she needed to get a clean catch on her. She explained to the girl to take the first towelette and wipe down one side of the labia, then the second down the other and the third down the middle, then put it in the specimen cup. Well, the girl put the towelettes in the specimen cup, not the urine.