Possible Clues:

• Keep-it-clean routine
• Junior high health class topic
• High-school class
• Health class topic
• That's a clean way to greet a girl, by the sound of it
• It's round - and clean - to greet the girl like this
• Clean practices
• Hospital eyeing changes in healthy practice
• Hotel eyeing reform of sanitation
• Sounds like the way to greet a girl, so long as you keep it clean