The power of a side comment made to me:
When I was in my 20’s, I was at a friend’s house, finishing a glass of water. I was just about to rinse out the glass at the sink when my friend’s mother said, “I don’t understand why people rinse a glass without scrubbing the rim of the glass. Rinsing the inside of the glass doesn’t clean the dirtiest part where the lips touched the glass.”