eli5: you know that film saliva leaves on the edges of cups or in your dog’s food bowl? What’s the purpose of it being kind of water-repellent and hard to remove even with soap?

Question

eli5: you know that film saliva leaves on the edges of cups or in your dog’s food bowl? What’s the purpose of it being kind of water-repellent and hard to remove even with soap?

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Answer 1

No, not biofilm—that’s from leaving water stagnant too long. I change my dog’s bowls every day and my coffee mug that I drink out of and both get it.