I have a 19mo daughter who spends ~30hrs/week with a nanny. She "teaches" her to say "please" by forcing her to say it and withholding a wanted item until she does. And forces a "thank you" afterward. I feel like this does less teaching and more just creating a mimic. I feel like manners is best taught by modeling, but I recognize this is a very passive method.
Is there a more interactive way to teach politeness and manners without forcing it?
EDIT: What about saying you're sorry? I'm a firm believer that forcing a child to say they are sorry after hitting another kid or taking a toy or whatever just won't work in teaching them to feel true remorse for their actions.